Many people suggest to master one area before moving to the next. Looks like you know what you are doing, but time seems to be the issue. Try to understand in and out, say, Number Properties and do practice questions. Know why the correct answer is correct and incorrect answer is incorrect. Keep the error log
and do the questions you got wrong again until you get them right. But try not to memorize the answer, but understand how to actually solve the problem. If this works for you, you can do the same with VICs, Equalities...
Try to not move to the other areas before you feel comfortable in the topic area you have started.
If you learn to do things that you need to do - then someday - you can do things that you want to do.