For general chemistry 2, the math isn't the complicated part. The highest level of math you will encounter in Gen Chem 2 is with chemical kinetics, and using the first order integrated rate law. Even that is given to you, if not, you can just memorize it.
Chem 2 is more conceptual with plugging in numbers into equations, most kids will blindly plug in numbers into random equations, or won't make sure that the units need to cancel out, eg.. Arrhenius' equation What I suggest is, understanding the concepts inside and out, and knowing basic periodic trends. Once you understand concepts, you can easily do the calculations as they are not that difficult. What textbook are you guys using?
I didn't do as well as I would have liked on my general chemistry 2 course over summer because I got too absorbed with the material, and wanted to understand everything. So for a summer class, understand the main notes your professor puts on slides, and know how to do lecture problems. Redo the homework. Understand the concepts. And try a few problems from the book. As long as you understand the concept, you can essentially do any problem from the book, as it's all fairly simple.
Make sure you know the basic periodic trends from CHEM 1 because they carry on over to organic.
Also, if you got a 52.. And you do well in lab, and on exam 2 + 3 you can still probably get around a B - B+. Depending on if there's a curve, you can maybe get an A- or slightly an A.
For instance, for colligative properties, how many ways can they ask you to solve a freezing point depression question? They can throw you off, by not telling you the second component so you need to assume the total is 100g etc. Or, you might need to find MW of a compound using this formula. You get the idea? Concepts --> Problems
If you need gen chem 2 help, you can pm me