HELP!! COURSE REGISTRATION ADVICE!!

Hi! I want to start off with saying that I am upcoming freshman and will major in Computer Engineering (might change major). I had no idea at all that I was supposed to take a math and chemistry placement exams so I missed both dates. The next dates are sometime during early September, however my first course registration pass is August 1st. What courses should I take since (at least for the fall quarter) I don't qualify for the math/chem courses? Any GE's I should take? Recommendations? Really confused on what to do with my situation!!