diff --git a/app/controllers/v2_errors_controller.rb b/app/controllers/v2_errors_controller.rb
new file mode 100644
index 0000000..fc9061d
--- /dev/null
+++ b/app/controllers/v2_errors_controller.rb
@@ -0,0 +1,33 @@
+class V2ErrorsController < ApplicationController
+  before_action :authenticate_user!
+
+  def summary
+    # Preguntas fallidas del usuario
+    failed_answers = Current.user.user_answers.incorrect.includes(question: [ :answers, { clinical_case: :category } ]).recent
+
+    # Agrupar por especialidad (categoría) para el resumen
+    specialties_count = failed_answers.each_with_object(Hash.new(0)) do |ua, hash|
+      category = ua.question.effective_category
+      hash[category] += 1 if category
+    end
+
+    most_failed_specialties = specialties_count.map do |category, count|
+      { id: "esp#{category.id}", name: category.name, count: count }
+    end.sort_by { |s| -s[:count] }.take(5)
+
+    recent_failed_questions = failed_answers.take(10).map do |ua|
+      {
+        id: "q#{ua.question.id}",
+        question: ua.question.text,
+        correctAnswer: ua.question.answers.find(&:is_correct?)&.text,
+        userAnswer: ua.answer.text,
+        explanation: ua.answer.description # O la del correct answer si estuviera ahí
+      }
+    end
+
+    render json: {
+      mostFailedSpecialties: most_failed_specialties,
+      recentFailedQuestions: recent_failed_questions
+    }
+  end
+end
diff --git a/app/controllers/v2_flashcards_controller.rb b/app/controllers/v2_flashcards_controller.rb
new file mode 100644
index 0000000..fc920e3
--- /dev/null
+++ b/app/controllers/v2_flashcards_controller.rb
@@ -0,0 +1,33 @@
+class V2FlashcardsController < ApplicationController
+  before_action :authenticate_user!
+
+  def review
+    # Obtener flashcards pendientes de repaso para el usuario actual
+    user_flashcards = Current.user.user_flashcards.due.limit(20)
+
+    # Si no hay pendientes, podríamos sugerir algunas nuevas o simplemente enviar vacío
+    # El requisito dice que el backend decide según SRS
+
+    render json: {
+      flashcards: user_flashcards.map { |uf|
+        {
+          id: uf.flashcard.id,
+          front: uf.flashcard.front,
+          back: uf.flashcard.back,
+          category: uf.flashcard.category&.name || "General"
+        }
+      }
+    }
+  end
+
+  def answer
+    user_flashcard = Current.user.user_flashcards.find_by(flashcard_id: params[:id])
+
+    if user_flashcard
+      user_flashcard.review(params[:quality].to_i)
+      render json: { message: "Respuesta registrada", next_review: user_flashcard.next_review }
+    else
+      render json: { error: "Flashcard no encontrada para este usuario" }, status: :not_found
+    end
+  end
+end
diff --git a/app/controllers/v2_images_controller.rb b/app/controllers/v2_images_controller.rb
new file mode 100644
index 0000000..d97e294
--- /dev/null
+++ b/app/controllers/v2_images_controller.rb
@@ -0,0 +1,35 @@
+class V2ImagesController < ApplicationController
+  before_action :authenticate_user!
+
+  def bank
+    # El banco de imágenes se basa en casos clínicos que tienen imágenes adjuntas
+    cases = ClinicalCase.with_attached_image.published
+
+    if params[:category].present?
+      cases = cases.joins(:category).where(categories: { name: params[:category] })
+    end
+
+    if params[:search].present?
+      search = "%#{params[:search]}%"
+      cases = cases.where("clinical_cases.name LIKE :search OR clinical_cases.tags LIKE :search", search: search)
+    end
+
+    cases = cases.paginate(page: params[:page] || 1, per_page: 20)
+
+    render json: {
+      images: cases.map { |c|
+        {
+          id: "img#{c.id}",
+          url: (rails_blob_url(c.image, only_path: false) rescue nil),
+          title: c.name,
+          category: c.category.name,
+          tags: c.tag_list
+        }
+      },
+      pagination: {
+        current: cases.current_page,
+        total: cases.total_pages
+      }
+    }
+  end
+end
diff --git a/app/controllers/v2_knowledge_base_controller.rb b/app/controllers/v2_knowledge_base_controller.rb
new file mode 100644
index 0000000..79a6e47
--- /dev/null
+++ b/app/controllers/v2_knowledge_base_controller.rb
@@ -0,0 +1,26 @@
+class V2KnowledgeBaseController < ApplicationController
+  before_action :authenticate_user!
+
+  def index
+    topics = Topic.includes(:articles)
+
+    if params[:topic].present?
+      topics = topics.where("title LIKE ?", "%#{params[:topic]}%")
+    end
+
+    if params[:search].present?
+      search = "%#{params[:search]}%"
+      topics = topics.joins(:articles).where("articles.title LIKE :search OR articles.content LIKE :search", search: search).distinct
+    end
+
+    render json: {
+      topics: topics.map { |t|
+        {
+          id: "t#{t.id}",
+          title: t.title,
+          articles: t.articles.map { |a| { id: "a#{a.id}", title: a.title } }
+        }
+      }
+    }
+  end
+end
diff --git a/app/controllers/v2_leaderboard_controller.rb b/app/controllers/v2_leaderboard_controller.rb
new file mode 100644
index 0000000..f869474
--- /dev/null
+++ b/app/controllers/v2_leaderboard_controller.rb
@@ -0,0 +1,31 @@
+class V2LeaderboardController < ApplicationController
+  before_action :authenticate_user!
+
+  def national
+    # En un entorno real, esto podría estar cacheado o usar una tabla de rankings
+    # Para esta implementación, calculamos on-the-fly ordenando por total_points
+
+    users_with_points = User.all.sort_by(&:total_points).reverse
+
+    top_players = users_with_points.take(100).each_with_index.map do |user, index|
+      {
+        rank: index + 1,
+        nickname: user.username || user.name || "DoctorX",
+        points: user.total_points,
+        avatar: "https://via.placeholder.com/150"
+      }
+    end
+
+    current_user_rank = users_with_points.index(Current.user) + 1 rescue nil
+
+    render json: {
+      currentUser: {
+        rank: current_user_rank,
+        points: Current.user.total_points,
+        avatar: "https://via.placeholder.com/150",
+        nickname: Current.user.username || Current.user.name || "DoctorX"
+      },
+      topPlayers: top_players
+    }
+  end
+end
diff --git a/app/models/article.rb b/app/models/article.rb
new file mode 100644
index 0000000..f3608bd
--- /dev/null
+++ b/app/models/article.rb
@@ -0,0 +1,4 @@
+class Article < ApplicationRecord
+  belongs_to :topic
+  validates :title, presence: true
+end
diff --git a/app/models/clinical_case.rb b/app/models/clinical_case.rb
index 94e2d6b..4d69839 100644
--- a/app/models/clinical_case.rb
+++ b/app/models/clinical_case.rb
@@ -13,6 +13,10 @@ class ClinicalCase < ApplicationRecord
   validates :name, presence: true
   validate :image_must_be_valid
 
+  def tag_list
+    tags&.split(",")&.map(&:strip) || []
+  end
+
   private
 
   def image_must_be_valid
diff --git a/app/models/topic.rb b/app/models/topic.rb
new file mode 100644
index 0000000..dbdebb6
--- /dev/null
+++ b/app/models/topic.rb
@@ -0,0 +1,4 @@
+class Topic < ApplicationRecord
+  has_many :articles, dependent: :destroy
+  validates :title, presence: true
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index 0ccb62d..02bbb95 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -47,7 +47,9 @@ def calculate_accuracy
   end
 
   def total_points
-    achievements.sum(:points) || 0
+    achievement_points = achievements.sum(:points) || 0
+    correct_answer_points = user_answers.correct.count
+    achievement_points + correct_answer_points
   end
 
   def answered?(question)
diff --git a/config/routes.rb b/config/routes.rb
index c7b5b20..602b109 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,4 +1,12 @@
 Rails.application.routes.draw do
+  # V2 Endpoints
+  get "v2/leaderboard/national", to: "v2_leaderboard#national"
+  get "v2/images/bank", to: "v2_images#bank"
+  get "v2/flashcards/review", to: "v2_flashcards#review"
+  post "v2/flashcards/review/:id/answer", to: "v2_flashcards#answer"
+  get "v2/knowledge-base", to: "v2_knowledge_base#index"
+  get "v2/errors/summary", to: "v2_errors#summary"
+
   # Nuevas rutas unificadas
   resources :users do
     collection do
diff --git a/db/migrate/20260310120343_add_tags_to_clinical_cases.rb b/db/migrate/20260310120343_add_tags_to_clinical_cases.rb
new file mode 100644
index 0000000..a531a8f
--- /dev/null
+++ b/db/migrate/20260310120343_add_tags_to_clinical_cases.rb
@@ -0,0 +1,5 @@
+class AddTagsToClinicalCases < ActiveRecord::Migration[8.1]
+  def change
+    add_column :clinical_cases, :tags, :string
+  end
+end
diff --git a/db/migrate/20260310120345_create_topics_and_articles.rb b/db/migrate/20260310120345_create_topics_and_articles.rb
new file mode 100644
index 0000000..7296088
--- /dev/null
+++ b/db/migrate/20260310120345_create_topics_and_articles.rb
@@ -0,0 +1,15 @@
+class CreateTopicsAndArticles < ActiveRecord::Migration[8.1]
+  def change
+    create_table :topics do |t|
+      t.string :title
+      t.timestamps
+    end
+
+    create_table :articles do |t|
+      t.string :title
+      t.text :content
+      t.references :topic, null: false, foreign_key: true
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index de6aca5..d4d0207 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_02_22_040006) do
+ActiveRecord::Schema[8.1].define(version: 2026_03_10_120345) do
   create_table "achievements", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
     t.datetime "created_at", null: false
     t.json "criteria"
@@ -59,6 +59,15 @@
     t.index ["question_id"], name: "index_answers_on_question_id"
   end
 
+  create_table "articles", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
+    t.text "content"
+    t.datetime "created_at", null: false
+    t.string "title"
+    t.bigint "topic_id", null: false
+    t.datetime "updated_at", null: false
+    t.index ["topic_id"], name: "index_articles_on_topic_id"
+  end
+
   create_table "categories", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
     t.datetime "created_at", null: false
     t.string "description"
@@ -72,6 +81,7 @@
     t.text "description"
     t.string "name"
     t.integer "status", default: 0
+    t.string "tags"
     t.datetime "updated_at", null: false
     t.bigint "user_id"
     t.index ["category_id"], name: "index_clinical_cases_on_category_id"
@@ -146,6 +156,12 @@
     t.index ["user_id"], name: "index_specialist_profiles_on_user_id"
   end
 
+  create_table "topics", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.string "title"
+    t.datetime "updated_at", null: false
+  end
+
   create_table "user_achievements", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
     t.datetime "achieved_at"
     t.bigint "achievement_id", null: false
@@ -234,6 +250,7 @@
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "answers", "questions"
+  add_foreign_key "articles", "topics"
   add_foreign_key "clinical_cases", "categories"
   add_foreign_key "clinical_cases", "users"
   add_foreign_key "exam_questions", "exams"
diff --git a/test/controllers/v2_endpoints_test.rb b/test/controllers/v2_endpoints_test.rb
new file mode 100644
index 0000000..c1809c7
--- /dev/null
+++ b/test/controllers/v2_endpoints_test.rb
@@ -0,0 +1,48 @@
+require "test_helper"
+
+class V2EndpointsTest < ActionDispatch::IntegrationTest
+  setup do
+    @user = User.create!(email: "test@example.com", password: "password123", username: "testuser")
+    @category = Category.create!(name: "Test Category")
+    @token = JsonWebToken.encode(user_id: @user.id)
+    @headers = { "Authorization" => "Bearer #{@token}" }
+  end
+
+  test "should get national leaderboard" do
+    get "/v2/leaderboard/national", headers: @headers
+    assert_response :success
+    json = JSON.parse(response.body)
+    assert_includes json.keys, "currentUser"
+    assert_includes json.keys, "topPlayers"
+  end
+
+  test "should get image bank" do
+    get "/v2/images/bank", headers: @headers
+    assert_response :success
+    json = JSON.parse(response.body)
+    assert_includes json.keys, "images"
+    assert_includes json.keys, "pagination"
+  end
+
+  test "should get flashcards for review" do
+    get "/v2/flashcards/review", headers: @headers
+    assert_response :success
+    json = JSON.parse(response.body)
+    assert_includes json.keys, "flashcards"
+  end
+
+  test "should get knowledge base" do
+    get "/v2/knowledge-base", headers: @headers
+    assert_response :success
+    json = JSON.parse(response.body)
+    assert_includes json.keys, "topics"
+  end
+
+  test "should get errors summary" do
+    get "/v2/errors/summary", headers: @headers
+    assert_response :success
+    json = JSON.parse(response.body)
+    assert_includes json.keys, "mostFailedSpecialties"
+    assert_includes json.keys, "recentFailedQuestions"
+  end
+end