Compassion
It takes a lot of time and a lot of effort to do what i did. But it's not a big mystery or a situation where you never know if you're ready for the tests.
At some point, hopefully in your 1st semester of tough science/math, you will discover the level of effort that lets you LEARN enough to make A's on TESTS, which should become the focal points of your life. You start to schedule [mostly, postpone/cancel] everything else in your life that doesn't help you get A's on all those tests. Time management is the whole thing. You are shooting for 3.5 science.
For sure the level of effort is way, WAY higher than almost all your classmates. That's why 80-90% of the test questions will seem easy to you, the rest you can predict pretty well before your get your grade back. Okay I guessed on 3 questions, i think i will miss 2 of those, my grade is either ___ or ___ (say, 91 or 94...) and again, most of your classmates will be shocked to hear you even talk like that, much less be right.
A big reason why i tested out of college algebra [and actually knew less than 50% of it] is that these are 13th-grade classes. Where you're surrounded by 18/19-yr-old kids whose mommys are making them "take some college classes". Look in a fall class schedule. It funnels down, from 22 college Alg sections to 12 Int Alg sections to 4 Trig classes to 2 Calc classes.
That's the drop-off in a state school. Similar deal for Intro to Chem, Chem1, Chem2, Org1, Org2. If you can skip Intro (chm1025) and go straight into chm1045, like i did, that will help get you out of the sea of slackers. Those kids are very cool for 2 to 4 years, and then will make literally millions less $$ than you over the rest of their lifetime.
My $.02