Good ways to study math for tests?

My college has a math test that I need to score higer on if i ever want to graduate anytime soon. Currently i can only get into math 97 and really need to retake the test so i can bump up my placement score. But I have no knowledge of anything that could really help me. looking to get like enough info to score high enough to get into math 99 or so. Just really need a refresher course in math. Is their something online that could help?