After you take an LSAT diagnostic, it's extremely helpful to take stock of the questions you missed, to break down the misses into question categories & question types. Doing so reveals which question categories/types, if any, were particularly problematic for you, and helps you prioritize your prep, moving forward. The same is true for subsequent practice tests and for any actual LSAT score, if you intend to take the test again. If you don't have the time or energy to do this yourself, let me know. I conduct such inventories for the price of $25 per LSAT (whether diagnostic LSAT, subsequent practice LSAT, or actual LSAT).