The method I use when taking an exam is to download the objectives and copy the objectives, sub-objectives, and tasks into a spreadsheet. 

I evaluate how well I understand each of the tasks. I create my revision plan from the results of the evaluation.

I try and revise for a minimum of 30 minutes per day. I find that making time for regular revision helps me learn. 

I also try to #GetHandsOn. By this I mean using the Power Platform, customizing and creating apps in a Power Platform environment.

If you do not have access to a Power Platform environment, you should create a trial. You can sign up for free with the community plan at https://powerapps.microsoft.com/communityplan or start a free 30-day trial. You can find my trial instructions at https://tinyurl.com/trydyn.

Microsoft exams follow the same structure.