This website offers practice with fractions in a fun, game-based manner. This is the same website I showed my Advanced Math class but would be appropriate for all students. Determine which skill you need the most help on and practice that skill first to help you master it.
The main website is:
http://www.sheppardsoftware.com/math.htm
I recommend anything under the Fractions section but we looked at the Least Common Denominator and Adding Fractions game during class today.