Having at least a few hours of sleep between all that shit you studied and your test will get better results than pulling an all nighter to study like 4 more hours. First of all, your brain sucks balls at information storage and retrieval when you’re exhausted. And second of all, sleep is when your brain organizes all the new info you picked up, so you will actually remember more of what you studied after you’ve slept.
Attend your lectures. I found that even if I was doing work for another class or playing on my iPad, I still gained something from attending lectures.
Go to office hours and build a relationship with your professors.
Create a four year plan of all of your classes. Your advisor may not be a good one and can fuck you over.
Take some summer classes at your local community college (check to make sure they transfer over).
Don’t overly stress yourself out with grades. C’s get degrees (unless you’re trying to go to grad school or professional school, then you’re going to have to try harder than a C)
Someone I know almost didn’t graduate this semester because his advisor gave him all of his easy classes in the fall semester and made him take 18 credits of hard engineering classes this spring. My advisor didn’t allow me to request a time override despite them only having a conflict of one hour on one day. I need both of those classes to graduate and I couldn’t take the other section because it was during the same time of my other major class. Luckily, it was a blessing in disguise and I was able to take that class this summer at a community college which was way easier than taking it at my home institution
That reminds me of another important tip. 12 credits isn’t full time unless you want to take 5+ years. You need 15/16 credits per semester average to actually graduate in 4 years.