The review exercises aren't at the beginning of a session. They come after a lecture to practice the concept taught. I'd reduce them to 4 first and go down from there. The computer should adjust the number of exercises anyway based on your child's performance, so most in my group leave them set at six.
The best way to "speed things up" is to start with proper placement. I recommend setting up an Initial Placement Test for each of your children. I typically use the 48 question/45 minute test rather than the 100 question version. I've found it very accurate. You'll need to switch the curriculum to reinforcement to set up the test. After the test's completed, the program will automatically set the new grade placement. Then switch the curriculum back to gifted.
