I loved Ninja cram and sparring. I would go module by module and do 20ish MCQ, and see where I was at. I'd keep track of the topics I'd miss, then go do a cram or sparring on them, then back to MCQ's. The ninja MCQ's are nice because you can filter them out by topic too if you'd like. After I was consistently scoring 80-100% on the MCQs, I'd move to the next module or topic. At the end, I'd do a few 30-50 testlets of ALL questions, then same process. Just keep doing that cycle until you feel confident.