Hello! It depends on what his other grades are in the class. Usually, tests have more weight than homework assignments and quizzes.
I'm going to solve for his test grade average.
88 + 100 = 188/2 = 94
Jason will need a 100% on his next test in order to bring his test average to a 94%, however, he will be able to bring it to a 95% if extra credit is available. Hope this helps! :)