Worthwhile
Spend a month or two studying with this if you can. Use it daily, spend an hour or two a day, or at least twenty minutes. Take the fake tests on specific parts AND the workouts, and study what you score low on. Id say my sat score was boosted by as much as 200-300 points by studying with this and refreshing my memory of harder concepts.
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SAT Up - New SAT Test Prep and Tutoring, v3.0.4