<p>Practice. Otherwise, you just have it.</p>
<p>I graduate next week with a degree in applied math and statistics. I took a lot of pure math classes. A fair amount of me getting through almost my entire core of classes this year was due to talent, but I put in some work for classes that were a bit tougher. </p>
<p>I was told basically you either get it or you don’t before I took an intro to proofs class. Something about the wiring of our brains. The people who didn’t switched out and the people who did mostly stayed. Some couldn’t finish and switched majors.That’s more for the upper-division level classes, though. I think anyone with a reasonable amount of analytical ability anyone can do well in the calculus series. But yeah, your problems in algebra will definitely be a problem when it comes to calculus. I mostly watched MIT videos to supplement my understanding when I took the courses.</p>
<p>I’d just review through khan academy or something. I honestly don’t think you really need to brush up over the summer just for a calculus class, though…</p>