I think since each of the aamc practice tests are probably as representative of the real exam as you can get, they should only be taken, under exam conditions (timing etc.), after one has completed their content review. Use other non-official practice tests (e.g. kaplan, EK, TPR) to help you with your test taking ability as you build on your base knowledge.
Going over the solutions is usually a good idea for the aamc tests, but i found that sometimes i was dissatistifed with the solution given by the aamc for certain questions in certain sections (usually VR - where the answers can seem more subjective).
If you have the time its probably a good idea to also go over the questions you got correct also, to see if your train of thought parallels the way the question should have been approached. Seldomly i found that i would get a question right, but only serindipidously, as my manner of thinking was very different (and was probably incorrect) when compared with the aamc solutions.
