I've studied a number of different subjects at University / College level, now, and one thing that I've learned most recently is that half the battle is in figuring out what they want from you so you can figure out how to be able to do that.
What I mean is that I've had to adapt my study techniques for the different classes because the different subjects required different things from me.
I'm pretty good at essays. At the blend of summary and then using that as a platform to argue for / defend / present my own view.
I've had a lot to learn about solving equations. And I've had a lot to learn about study habits for science, more generally. I'm alright at the memorization that is required for much of biology, but chemistry and physics have come much harder to me.
Khan Academy is something that I've kept coming back to and I wanted people to know that it's out there, in case they don't, and people are doing subjects that are covered over there.
There are a bunch of little youtube videos that take you through vast chunks of the Secondary School / early / general University / College curriculum for science and for maths.
The videos vary in quality quite a bit. Some of them have known mistakes, were recorded years ago in very low resolution. Others of them are just glorious. Different colored chalk to track different variables through equations, some of them in association with the American Medical Colleges, and so on. There is a whole MCAT preparation 'stream' that I've discovered if pretty useful for me to work through.
One of the things with the videos... Is that it shows you a way of studying. What the presenters are doing, I mean. That's what I try and do (out loud!) when I'm studying. Try and tell someone... The way things are. To describe it. Then you get to a bit and realise you forgot or you aren't sure so you need to look it up. But being able to present the video without reference to other material... To be able to work simple numeric examples like that... Is a great way of learning. And one that is (in some sense) fun.
Anyway... Check it out, if you haven't already.
How to think of intelligence:
https://www.khanacademy.org/youcanlearnanything
The Alveolar gas equation
https://www.khanacademy.org/science/...quation-part-1
But, of course, before you get to the Alveolar gas equation it is helpful to know about various other things like this:
https://www.khanacademy.org/science/...ates-of-matter