Besides Kaplan and Princeton, can anyone inform me of other test prep materials that will give me actual practice with test-like problems?

Thanks.

DAT Destroyer
Cliffs AP bio review (do the questions following each chapter)
Crack DAT PAT
Top Score
Acheiver (I didnt but this software and dont plan to)
any AP chem / AP Bio / MCAT books are also helpful
ADA sample DAT
http://www.ada.org/prof/ed/testing/dat/dat_test_sampleitems.pdf
i just found these on the forums , chemistry olympiad exams
http://portal.acs.org:80/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_SUPERARTICLE&node_id=1508&use_sec=false&sec_url_var=region1&__uuid=0775bff7-3e7b-4111-8238-a54295367662
otherwise you can look at some peoples "DAT breakdown" type posts where they explain their study materials