I have a 80% gpa and super excited about college!! but tired of failing test!!

I want to at least get my GPA up to a 87% or something. 
So when ever there's a test I try my hardest and I dont cheat. In different classes my teachers assigns the student to a seat to take there test, I'm usually always seated away from a friend. Which is perfectly fine. It's just the moment I start the test and don't know an answer I glance up and see my friends exchanging answers or secretly asking for help. 
It's really annoying to get your test back and then see that you failed!! while everyone that cheated got a good score and boost up their gpa. I have college fever and some of the colleges that I want to go to might not be please with just an 80% gpa!
Like I don't know it's not fair. I'm the only one of my friends that's excited about college. And I try my hardest but they still end up succeeding and I don't. How? Any advice!?! 
UPDATE SORRY ABOUT THE TYPOS. I hope it's better now but in my highschool we do things based on percentages. But yea my average as an 80 converted would be 2.7! Click the picture