SOA WA21 Video Solutions
I have posted 80 video solutions (one solution for each part) to the SOA Written Answer 21. The videos total more than 6.5 hours of action packed fun! 
I highly recommend that you save the SOA WA21 until after you have finished all the material and worked a lot of practice problems. Basically treat them like 21 sample exams. For each problem set a timer for 2.5 minutes x the number of points for that problem. For example, problem 1 is worth 8 points so set a timer for 8 x 2.5 = 20 minutes. Work the problem under exam conditions (no peeking at formula sheets and no peeking at the solution) for the entire 20 minutes.
If you get the problem right take a look at my handwritten solution or the SOA’s solution. If you get the problem wrong then watch my video solution.