Bank statements. One sort of financial record is a bank statement. Your bank will regularly send a statement containing information showing income (credits) and outgoings (debits) on your bank account.
They're synonyms. Gain is the most general. Attain usually means to reach a goal or milestone (he attained the rank of captain). Obtain usually implies careful planning or some effort to get to the thing or goal. But they have probably something like 80% overlap in meaning.
College MUST mean something to you if you're going to get anything out of it. If it doesn't have some intrinsic meaning or value to you, forget it. The major difference between the K-12th grade education you received and the education you may earn at a College is just that: you must earn your college degree. Everything else up to this point in your life has been an entitlement. Everyone is entitled to a high school education. A college degree must be earned. It is NOT an entitlement.