diff --git a/app/controllers/report_controller.rb b/app/controllers/report_controller.rb
--- a/app/controllers/report_controller.rb
+++ b/app/controllers/report_controller.rb
@@ -1,3 +1,5 @@
+require 'csv'
+
 class ReportController < ApplicationController
 
   before_filter :authenticate
@@ -23,7 +25,7 @@
     @scorearray = calculate_max_score(@problems, @users,0,0,true)
 
     #rencer accordingly
-    if params[:commit] == 'download csv' then
+    if params[:button] == 'download' then
       csv = gen_csv_from_scorearray(@scorearray,@problems)
       send_data csv, filename: 'max_score.csv'
     else
@@ -57,7 +59,7 @@
     @scorearray = calculate_max_score(@problems, @users,since_id,until_id)
 
     #rencer accordingly
-    if params[:commit] == 'download csv' then
+    if params[:button] == 'download' then
       csv = gen_csv_from_scorearray(@scorearray,@problems)
       send_data csv, filename: 'max_score.csv'
     else
@@ -485,4 +487,35 @@
     return scorearray
   end
 
+  def gen_csv_from_scorearray(scorearray,problem)
+    CSV.generate do |csv|
+      #add header
+      header = ['User','Name', 'Activated?', 'Logged in', 'Contest']
+      problem.each { |p| header << p.name }
+      header += ['Total','Passed']
+      csv << header
+      #add data
+      scorearray.each do |sc|
+        total = num_passed = 0
+        row = Array.new
+        sc.each_index do |i|
+          if i == 0
+            row << sc[i].login
+            row << sc[i].full_name
+            row << sc[i].activated
+            row << (sc[i].try(:contest_stat).try(:started_at)!=nil ? 'yes' : 'no')
+            row << sc[i].contests.collect {|c| c.name}.join(', ')
+          else
+            row << sc[i][0]
+            total += sc[i][0]
+            num_passed += 1 if sc[i][1]
+          end
+        end
+        row << total 
+        row << num_passed
+        csv << row
+      end
+    end
+  end
+
 end
diff --git a/app/models/problem.rb b/app/models/problem.rb
--- a/app/models/problem.rb
+++ b/app/models/problem.rb
@@ -3,6 +3,7 @@
   belongs_to :description
   has_and_belongs_to_many :contests, :uniq => true
   has_many :test_pairs, :dependent => :delete_all
+  has_many :testcases, :dependent => :destroy
 
   validates_presence_of :name
   validates_format_of :name, :with => /^\w+$/
diff --git a/app/models/testcase.rb b/app/models/testcase.rb
new file mode 100644
--- /dev/null
+++ b/app/models/testcase.rb
@@ -0,0 +1,4 @@
+class Testcase < ActiveRecord::Base
+  belongs_to :problem
+  attr_accessible :group, :input, :num, :score, :sol
+end
diff --git a/app/views/report/max_score.html.haml b/app/views/report/max_score.html.haml
--- a/app/views/report/max_score.html.haml
+++ b/app/views/report/max_score.html.haml
@@ -11,7 +11,7 @@
           Select problem(s) that we wish to know the score.
         = label_tag :problem_id, "Problems"
         = select_tag 'problem_id[]',
-            options_for_select(Problem.all.collect {|p| ["[#{p.name}] #{p.full_name}", p.id]}),
+            options_for_select(Problem.all.collect {|p| ["[#{p.name}] #{p.full_name}", p.id]},params[:problem_id]),
             { class: 'select2 form-control', multiple: "true" }
   .col-md-4
     .panel.panel-primary
@@ -41,8 +41,8 @@
             Only enabled users
 .row
   .col-md-12
-    = button_tag 'Show', class: "btn btn-primary btn-large"
-    = button_tag 'Download CSV', class: "btn btn-primary btn-large"
+    = button_tag 'Show', class: "btn btn-primary btn-large", value: "show"
+    = button_tag 'Download CSV', class: "btn btn-primary btn-large", value: "download"
 
 - if @scorearray
   %h2 Result
diff --git a/db/migrate/20161014091417_create_testcases.rb b/db/migrate/20161014091417_create_testcases.rb
new file mode 100644
--- /dev/null
+++ b/db/migrate/20161014091417_create_testcases.rb
@@ -0,0 +1,15 @@
+class CreateTestcases < ActiveRecord::Migration
+  def change
+    create_table :testcases do |t|
+      t.references :problem
+      t.integer :num
+      t.integer :group
+      t.integer :score
+      t.text :input
+      t.text :sol
+
+      t.timestamps
+    end
+    add_index :testcases, :problem_id
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20161008050135) do
+ActiveRecord::Schema.define(:version => 20161014091417) do
 
   create_table "announcements", :force => true do |t|
     t.string   "author"
@@ -236,6 +236,19 @@
 
   add_index "test_requests", ["user_id", "problem_id"], :name => "index_test_requests_on_user_id_and_problem_id"
 
+  create_table "testcases", :force => true do |t|
+    t.integer  "problem_id"
+    t.integer  "num"
+    t.integer  "group"
+    t.integer  "score"
+    t.text     "input"
+    t.text     "sol"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
+  add_index "testcases", ["problem_id"], :name => "index_testcases_on_problem_id"
+
   create_table "user_contest_stats", :force => true do |t|
     t.integer  "user_id"
     t.datetime "started_at"
diff --git a/spec/models/testcases_spec.rb b/spec/models/testcases_spec.rb
new file mode 100644
--- /dev/null
+++ b/spec/models/testcases_spec.rb
@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe Testcases do
+  pending "add some examples to (or delete) #{__FILE__}"
+end