I would definitely encourage you to start practicing as soon as possible
I definitely fell in the trap of overwhelming content review when funnily enough, many of the facts that I've memorized are not as much help as developing the endurance and test taking skills you get when taking FLs or doing passages.
Depends on how much you want to pay for it! If you haven't done NS yet, their FL 1 is free. I've also heard good things about EK, but their exams are $50 per FL. I just took NS FL 1 and I like how they show you how many people chose every answer choice.