My experience was from almost two decades ago and is atypical. I had decided to write it only just a month before the LSAT, and so I started prior tests only four weeks before the test date. In that time, I did 27 official practice tests. I also read a couple books and tried two unofficial tests.
I tracked my results in a spreadsheet and had a marginal improvement from 173.4 to 176 for the first five and last five tests. But, essentially all improvement happened after just ten tests.
In all practice tests, I did best in logic games, answering 98.1% correct, compared with 93.5% for logical reasoning and 91.4% for reading comprehension.
I was somewhat lucky and got 97/99 on the actual test, enough for a 180 that time (2 incorrect in logical reasoning). I had only got that twice in the practice tests with an expectation between 174 and 180 with a median of 176.
After each test I analyzed every incorrect answer as well as the ones I was less sure about. There were online forums where I could ask about, or see other people's analysis of the problem questions.
I think a strategy aimed understanding wrong answers in your weakest area can be a more efficient use of preparation time.
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