I got As in both semesters after "bombing" (solid low Bs) first two tests first semester. My advice, don't get cocky and practice, practice, practice. Also, don't get discouraged and don't be afraid to ask for help.
First semester, I walked into the first test after studying 30 minutes (I was overly cocky because I found out the day before that I had placed 3rd in my Advanced Gen Chem class, beating out pretty much all the chem majors. The prof throughout the class had teased/looked down on me for being a bio major.

). For the second test, I prepared by only doing the first two homework problems from each section because I only left 3 hours (granted, I had two upper level bio tests the morning of this test).

I literally had to work my ___ off the rest of the semester to have any chance at an A. As a result, I spent my entire fall break learning the concepts from the first two tests and studying for the next.
Lesson learned: Do all homework questions provided. As you do them, think though each step and make up a list of questions to ask yourself while you think about how to approach the problem. If you get it wrong, do not move on. Sit down and reread your notes until you understand where you misunderstood something. Double check with the prof/TA to make sure you did it correctly. Then, think up a couple of problems that combine all of the hardest concepts you learned that section and run through those and double check as hypotheticals with prof.
As the class averages dropped from an 85 the first test to 60s-70s (with many individuals dropping after the 3rd test), I moved up from low 80s to mid 90s range. I got the highest grade in the class by 4 pts on the final, making the 99% I needed to get an A. That was the hardest I've worked in any class ever (after the first 2 tests, of course), and I'll treasure the screenshot of my grades forever.
😉
Second semester seemed easier as a result. It's a lot more memorization, but I thought the concepts were easier than those from first semester.
One thing I saw in many other students was that they weren't committed to success. They had gotten a 90 or so (above average, but B+) on the first test, and were pleasantly surprised so they thought their studying worked. They kept spending the same amount of time as difficulty increased and then got depressed and pretty much stopped studying altogether. My roommate fell into this trap and barely made it out with a C+ first semester and then had to drop second semester. She went to class but tried to cram learning the material into 2-3 days before the test as working in other classes increased and didn't have time to ask for help as a result. By the final, she literally started the homework the night before at 7 pm for an 8 am final. smh. Don't do that. Commit yourself to getting an A and you'll have a chance.