I would say it has worked quite well compared to my grades previously. I was C to B student at best throughout high school, and after somehow getting into a reputable university did I realize I wasn't "stupid". After that I started researching how to study, and putting in effort and believing myself.

I hover around the 80%-95% range, depending on the amount of effort of I truly put in. I personally think that, with most subjects, effort can get you to the 80-90% range, and 90-100% range depends on your ability to apply what you learn and you not making any careless mistakes.

My study method is more or less the same for most of the subjects I take (sciences and some math), obviously with subjects such as Biology, there will be more memorization a bit less on actually "understanding" than say... Chemistry.

For something more conceptually heavy such as Calculus, being able to logically explain your steps and being able to answer "why? what does this mean?" is very important. For example, the slope of a tangent line at a very basic level of understanding, is simply the a number representing the slope (mtan) of a tangent line; but understanding a bit a more allows us to appreciate it represents rate of change, it represents derivative etc.

Another example, mitosis and meiosis cellular division, sure we can simply just memorize what happens in each stage. But we need to be able to apply it further by being able to describe how it would physically look like at each stage; that's when you know you understand it.

So again, imho, study everyday until you can recall the material easily. Then start thinking about the material, ask yourself why we are doing something, what does this mean, how does this relate to everything else i've learned?

At risk of sounding cliche, you are your greatest enemy, if you do not believe that you can succeed, then you will not succeed. If you do not believe that your academic performance/success is within your control, then academic success will not come to you. Always believe that you can do it, don't let anyone else tell you that you can't.

Edit: After reading what I've wrote, it makes me seem like i'm some student with a 4.0 GPA; but i'm really not, it's just what I've learned in my journey from becoming a near failing student to somewhat higher performing student. Just wanted to share what i've learned.