U should not worry about ur classes. U should concentrate on ur visa processing and bank statement. On the other hand, if u late to get visa, u should go for extension letter by ur uni or college.
I suggest u to try to matured ur bank statement at least 4 month, when it matured apply for visa. I know that ur country CHC takes more time to award u visa. In this case I mean after 4 week of ur visa processing case u should apply for extension letter and send it a copy and original CHC.