The more the merrier! I'll second what @kavimodi00 said above. Repeat, repeat, repeat. Do as many as you can!! I would recommend that you should really hone in on your difficulties and foolproof those specific games that give you trouble.
@alexhpcs Practice makes perfect! For me, I used to spend less time upfront, and would struggle answering questions with a fuzzy understanding of what I just read. Spend more time really comprehending what you have just read upfront on each passage …