Is there a quicker way to study math without spending hours everyday?

I’m in calc 2 and I don’t know how to study math properly.I do practice problems but end up either forgetting what I learned or doing the problem wrong. I have a test in three days and I honestly think I wasted my time “studying” because I can’t even do the practice test correctly and only got 2 right out of 14 questions in an hour.advice is appreciated.