<p>I also found those course not really worth it. Get a few prep books (probably from your local library) and work through the practice tests. Make sure you go through the answers on those you have missed. You should be able to recap your old Math skills in a few weeks. Interestingly, Math skills are usually hard to forget except for some rules. I still remember most of the middle school to high school math from 30+ years ago.
You are aiming at a 410 points increase, what is your current Math score? The CR and W section may be harder to increase the scores within a short period of time. Try to do at least one full section per day and 1-2 full times practice tests over the weekend. Forget about the prep courses. You just need to know some basic techniques other than the knowledge to answer the questions (e.g. when and how to guest, question format, etc). On the other hand, have you tried ACT?</p>