diff --git a/helpers/linkList.js b/helpers/linkList.js
new file mode 100644
index 00000000..983a30b3
--- /dev/null
+++ b/helpers/linkList.js
@@ -0,0 +1,7 @@
+module.exports = function(l){ 
+	ret = [];
+	for(i in l){
+		ret.push("<a href=\""+l[i]+"\">"+i+"</a>");
+	}
+	return ret.join(" | ");
+}
diff --git a/src/teaching/cse-462/checkpoint1.tgz b/src/teaching/cse-462/checkpoint1.tgz
new file mode 100644
index 00000000..ae0220d8
Binary files /dev/null and b/src/teaching/cse-462/checkpoint1.tgz differ
diff --git a/src/teaching/cse-462/index.md b/src/teaching/cse-462/index.md
index a55b8a4c..f587f4ab 100644
--- a/src/teaching/cse-462/index.md
+++ b/src/teaching/cse-462/index.md
@@ -4,64 +4,70 @@ classContent:
   - date:   Jan. 26
     topic:  Introduction and Outline
     meta:
-      slides: 01-IntroAndStructure.pdf
+      slides: slides/01-IntroAndStructure.pdf
   - date:   Jan. 28
     topic:  Relational Algebra
     meta:
-      slides: 02-RelationalAlgebra.pdf
+      slides: slides/02-RelationalAlgebra.pdf
       video: https://www.youtube.com/watch?v=qj67794J8eg
   - date:   Feb. 2
     topic:  SQL
     meta:
-      slides: 03-SQL.pdf
+      slides: slides/03-SQL.pdf
       video: https://www.youtube.com/watch?v=tp2X0NrlulY
   - date:   Feb. 4
     topic:  SQL to RA and Evaluation
     meta:
-      slides: 04-SQLToRAAndEval.pdf
+      slides: slides/04-SQLToRAAndEval.pdf
       video: https://www.youtube.com/watch?v=T-A9pMY-mPk
   - date:   Feb. 9
     topic:  Project 1 Overview, Generalized RA
     meta:
-      slides: 05-ExtendedRAProj1.pdf
+      slides: slides/05-ExtendedRAProj1.pdf
       video: https://www.youtube.com/watch?v=uB3wuS_Ykdg
   - date:   Feb. 11
     topic:  Data Layout (Serialization, Paging, Columnar)
     meta:
-      slides: 06-Storage.pdf
+      slides: slides/06-Storage.pdf
       video: https://www.youtube.com/watch?v=p8YJYruhNfY
   - date:   Feb. 16
     topic:  Data Organization (Sorting, Tree Indexes)
     meta:
-      slides: 07-Indexes.pdf
+      slides: slides/07-Indexes.pdf
       video: https://www.youtube.com/watch?v=Ai6C4foE5Kk
   - date:   Feb. 18
     topic:  Hash Indexes, Joins, and Optimization
     meta:
-      slides: 08-Indexes2.pdf
+      slides: slides/08-Indexes2.pdf
   - date:   Feb. 23
     topic:  Joins and Optimization
     meta:
-      slides: 09-Optimization.pdf
+      slides: slides/09-Optimization.pdf
   - date:   Feb. 25
     topic:  Midterm 1 Review
     meta:
-      slides: 10-Review.pdf
+      slides: slides/10-Review.pdf
       video: https://www.youtube.com/watch?v=qMdfQ65XKas
   - date:   Mar. 1
     topic:  __Midterm 1__
   - date:   Mar. 3
     topic:  External Algorithms
+    meta:
+      slides: slides/11-ExternalSort.pdf
   - date:   Mar. 8
     topic:  Project 2 Review
+    meta:
+      code: slides/12-Checkpoint2.zip
   - date:   Mar. 10
-    topic:  Cost-Based-Optimization
+    topic:  Data Modeling (E/R and Constraints)
+    meta:
+      slides: slides/13-DataModeling.pdf
   - date:   Mar. 15
     topic:  __Spring Break!__
   - date:   Mar. 17
     topic:  __Spring Break!__
   - date:   Mar. 22
-    topic:  Data Modeling (E/R and Constraints)
+    topic:  Cost-Based-Optimization
   - date:   Mar. 24
     topic:  Transaction Basics (Correctness, Equivalence, Locking)
   - date:   Mar. 29
@@ -143,10 +149,7 @@ In this course, you will learn...
 
 <ul>
 {{#each classContent}}
-<li>_{{date}}_:&nbsp;&nbsp;&nbsp;{{topic}}{{#if meta}} (
-  <a href="slides/{{meta.slides}}">slides</a>
-  {{#if meta.video}}| <a href="{{meta.video}}">video</a>{{/if}}
-){{/if}}</li>
+<li>_{{date}}_:&nbsp;&nbsp;&nbsp;{{topic}}{{#if meta}} ({{{linkList meta}}}){{/if}}</li>
 {{/each}}
 
 ------
diff --git a/src/teaching/cse-462/slides/12-Checkpoint2.zip b/src/teaching/cse-462/slides/12-Checkpoint2.zip
new file mode 100644
index 00000000..917ea71a
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