Old LSATs with proper blind review are beneficial in combination with those that you have not done. Repeating some questions actually helps cement reasoning patterns. Old games are especially good.
main tip : the $$ is in the review. Proper review trumps everything. You can burn through as many PTs as you like, but the review is how you get better.
I'm retaking in September. Located in DC proper. I have only studied on my own before never done a class. So although I took the test this structured practice is new to me.
Doing well on the LSAT is about building strong habits. This includes the test itself as well as other tangential things like a proper diet, exercise, and a strong psychological outlook. Everything is interrelated. I hope you do well!