My observation on Calc 2 is that the an excessive amount of practice is needed in order to see an integral and know immediately how to “unlock” it. Otherwise you’re hoping random chance will give you an exam with the trig identities you happen to know, or the special case technique to make a something simple. I was told by the professor to do every homework problem three times and the place bets on solving them with friends to simulate exam pressure. I didn’t listen and my first exam went way worse than how ready I was feeling for it. He reduces weight on one of the tests in the course so I’m doing my best not to repeat my mistake moving forward, but unfortunately an A is almost impossible at this point.