what are my chances of getting a 3.5 gpa

<p>hey guys new user here…from the caribbean…i’m a first year in college now and i am disappointed in my current grades…in high school we just used to average off all the scores of the tests by the number of tests and that was our score. but in college they have a weighing system… i recently got a 78/100 in a sociology test…and that’s disappointing…my main question is how can i get a 3.5 gpa when i am an economics major…it’s hard…projects coming from here and there…i need help because i need at least a 3.5 gpa to get into a good university…please help</p>