Warmup-1
Simple warmup problems to get started (solutions available)

Warmup-2
Medium warmup string/array loops (solutions available)

String-1
Basic string problems -- no loops

Array-1
Basic array problems -- no loops.

Logic-1
Basic boolean logic puzzles -- if else && || !

Logic-2
Medium boolean logic puzzles -- if else && || !

String-2
Medium String problems -- 1 loop

String-3
Harder String problems -- 2 loops

Array-2
Medium array problems -- 1 loop

Array-3
Harder array problems -- 2 loops, more complex logic

AP-1
AP CS medium problems

Recursion-1
Basic recursion problems

Recursion-2