True. For some people 10 is enough, others 20, and some 30.
It truly does depend on everything from your diagnostic, to your goal, to your innate LSAT/reasoning abilities. There is no "right" answer.
I know answers like this can be unhelpful, so I'll leave you with this. MOST (not all, but most) of the high scorers I personally know did around ~30 PTs. Sometimes multiple times.
I took and BR'd every single preptest that wasn't covered in the curriculum (36 - 78), and I would probably advise doing the same thing. I scored a 159 on my first preptest after finishing the curriculum (from a 153 diagnostic), and ended up consistently scoring in the high 160s before test day, and ended up with a 170 on the September exam.
The 40 or so preptests I completed were definitely a grind, but with a reasonable timeframe for studying, it definitely doesn't hurt to complete all of them before test day. You'll not only reinforce the concepts you learned in the curriculum, but by the time you reach the actual test, doing preptests will become so habitual that the real thing will simply feel like another PT.
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Also depends on your pride, and your health and focus and what you do for a day job or if you go to school.
It just depends on everything.
It truly does depend on everything from your diagnostic, to your goal, to your innate LSAT/reasoning abilities. There is no "right" answer.
I know answers like this can be unhelpful, so I'll leave you with this. MOST (not all, but most) of the high scorers I personally know did around ~30 PTs. Sometimes multiple times.
The 40 or so preptests I completed were definitely a grind, but with a reasonable timeframe for studying, it definitely doesn't hurt to complete all of them before test day. You'll not only reinforce the concepts you learned in the curriculum, but by the time you reach the actual test, doing preptests will become so habitual that the real thing will simply feel like another PT.
Cheers, and best of luck.