https://www.stochiki.com/w/index.php?title=Special:Manual&id=8
500+ free exercises mostly taken from various sources like SOA, MIT, UWindsor, etc.
If you want to track your progress, register and click on “performance”. If you have questions about the material, there is a Q&A forum for each page of the guide.
Please contact me if you would like to add your own problems/solutions as this is a wiki.