Practice Exams and QBanks peoples, recommend, concerning, additional

PalacioHill

I’ve been reading a lot throughout the threads concerning practice exams and qbanks.
My plan is to finish the CFAI text no later than April 15 and as my review do questions and exams almost exclusively. I have not purchased any additional study materials yet and I would like peoples’ opinions on the following questions.
What is more effective to use, practice exams or qbanks? How long do you recommend using them? How do they work? (online, hard copy, download, etc.)? Which brand seems to be the best?
I am quite lost on this issue and would appreciate any thoughts you could give me.
LSUtiger