Totally - GREAT tactic. Yes, complete the Kaplan exams THEN do the Section Tests! I recommend setting up a schedule like this:
Day 1 - Practice full-length exam.
Day 2 - Post-phrase the full-length exam. (Review all your answers and write out the correct explanations in your own words for questions you missed and guessed on)
Day 3 - Content & critical thinking review. (Go back over topics, concepts, practice problems, formulas, etc, for the issues you struggled with on your practice full-length. Complete topical tests, quizzes, High Yield Problems to deepen your understanding of those issues.)
Day 4 - Second full-length exam.
Day 5 - post-phrase second exam
Day 6 - review of topics
Day 7 - rest
Just don't take two full-lengths on the same day, or even on adjacent days. Ick. NEVER a good idea. Always stick a day in between. And don't feel the need to study immediately after taking a full-length. Give your brain a rest
Suggested order of exams:
1. Kaplan Practice Test #1
2. Kaplan Practice Test #2
3. Kaplan Practice Test #3
4. AAMC Practice Test #5
5. AAMC Practice Test #6
after the MCAT Strategy & Critical Thinking III Class
6. Kaplan Practice Test #4
7. AAMC Test #7
8. Kaplan Practice Test #5
9. AAMC Practice Test #8
10. additional practice (ie. any Kaplan)
then any AAMC Practice Test
11. additional practice (ie. any Kaplan)
then AAMC Practice Test