Gonna try to teach myself C++ this summer, any tips?

Well this is going to be my sophomore year in college, and I'm a CS major. The thing is, I failed Computer Programming last year and I'm determined to pass it this fall. So I was wondering, is there any software I can download so I can practice some programs before I start school? Last year we used JOVE to program, so I don't know if all the other softwares are the same, or completely different. I would gladly appreciate any help, thank you.