Don't pay any more than you need to each month on your student loan. This may seem obvious but it might not be.
Often times the loan's interest rate is lower than you could earn else where in interest. I consolidated my loans to a much lower fixed interest rate. I also set up auto payment and made my payments every month which lowered the interest rate even more. My rate is now only 1.875%.
The bottom line is try to earn interest on any extra money you have. If you can earn 5% in a money market account or a CD and your loan is 2% then your net gain is 3% instead of a net loss of 2%. Putting your money in mutual fund is even better but the returns aren't guaranteed so be careful.