If this sentence were to be used in a formal text such as an essay, it would need two important revisions. First, the spelling of the sentence needs to be changed so that the correct capitalization is used. The second modification that is necessary is using more formal language. Phrases such as "big bucks" are too informal to be used in an essay. A revised sentence would look something like this:
"I want to go back to school so that I can create significant wealth after I graduate."