The best way to prepare for the SAT or ACT is to mimic the testing process at home, as much as possible. You can create a test packet that is very similar to the one they will receive during the real test. Practicing with your test packet at home will give the most similar test results.
Here is how to make your own test packet. Start by buying a book of real tests. Below are the books I usually suggest.
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For SAT Preparation
For ACT Preparation
The Princeton Review Book: The Princeton Review Book: Cracking the ACT 2017 Edition
The ACT Company Book: The ACT Company Book: The Official ACT Prep Guide, 2016 - 2017
Take one whole test, with answer key, and slice it out of the book using an exacto knife (AKA "The Sword of Exact Zero" from the Lego Movie). Taking out one whole test like that will be the most like the test packet used at the real test. Then be ready to slice and dice that book to create a paper test packet. Here's how to use those books.
Be sure to correct the whole test exactly as they describe in the scoring process, so that your practice test at home score will be as close as possible to the real score your child will get.
Does that step by step instruction help?
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