What is the most effective review method?

I’m curious to find out what method folks are using. I just finished FSA (I started on that because I don’t have a finance background and it seems the most challenging to me). Then I went back and re-read all the examples and key concepts in Schweser once more. But I question its effectiveness. For example, the first time I read a topic… I generally get the concepts and can get 70% or so on concept checker problems at the end of each reading. But going back 3 weeks later for the review I have lost it all. Is this normal? I suppose I can shorten the time between reviews… but that really slows things down.