20 week grades

they are coming up and i am not prepared. i need to pick up my grades so i can get a good gpa. i need this gpa this year because i did not do so well last year. i want to get in a good colledge. that is the only way to be successfull in life quickly. if i go to csun or pierce then i might be sccessful, but maybe 2 or 4 yrs lator.