Yes, this is an outstanding guide to prep you for the ACT; however I have also found in invaluable in my tutoring students for the PSAT. The PSAT has a writing section (which includes grammar and essay correction neither of which is found on the SAT I). Many PSAT/SAT prep books prepare students well for the Critical Reading, the Sentence Completions, and the Analogy questions. But these same prep guides fall way short in prepping for the PSAT "Writing Section". The ACT on the other hand has a PSAT-similar writing section and prepping for this is a "joy" using the ACT Insider's Guide. Not only does the Insider's guide have a wealth of mock writing section problems, but it also has a far and away best grammar tutorial included as an appendix. I insist that my PSAT students read this appendix and do assignments in the ACT writing section of this book. The grammar appendix is an ACT (PSAT) focused treatment of grammar; yet I've had many students tell me that this appendix has helped them in their high school English courses and has provided backfill on grammar concepts that have heretofore escaped them. The Math section of the book contains many nuggets (mixture and work problems as examples) that the more "involved" student would find worthwhile in prepping for a high score on the SAT I or the PSAT. This book is fifteen bucks very well spent.
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