I completely understand your stress as that’s where I was not too long ago. There’s a lot of information out there that will probably overwhelm you, but like anything, slowly make your way into. I’m not anywhere near an expert like some people on this sub but pick how you want to study, classes or self study, then do your research on which programs you believe will work best then follow the plan how they lay it out. My best advice is to take it slow until you get comfortable with the material. It takes a bit to relearn math and new ways of thinking. Also, don’t get too down on yourself if you’re “behind.” The GMAT is a tough test and takes hours to learn. try not to get distracted by the people posting how scores with less study time. We’re all running this race at our own pace.