Schewser back of chapter concept checks and challenge questions vs real CFAI exam in terms of difficulty level

How do the Schweser back of chapter concept checks and challenge questions compare vs real CFAI exam in terms of difficulty level ??

Please advise as I am struggling with time to practice

unless you’ve done all the mocks possible, don’t waste your time with concept checkers. better do EOCs of CFA curriculum instead.

I agree with lemiman. As Marc Lefebvre says, Schweser does not write the exam. CFA Institute writes the exam so you should practice with CFA Institute questions.