I just finished 10th grade and i have a gpa of 3.5 is that good enough to get into a good university?

I'm not really sure what type of University you're lookin at. Harvard, probably not. Harvard probably requires a 4.0 or really close and really active in stuff. Most public state universities are pretty easy to get into if your GPA is above 2.6 or something. So you are off to a great start! A lot of colleges look at any volunteer work you do too which gives you an extremely good edge for colleges and jobs after college.