depends what you failed on,
afaik they dont fail you at s2 if you dont pass the maths they just make you re-sit at stage 3, so i guess you could try getting the pilapt-prep/cockpitweb programs and practicing on them!
for anyone who needs to brush up on maths i highly recommend this book, i used it for my stage 2 and found it a massive help, especially as i hadnt done some of the stuff for years.
http://www.amazon.co.uk/Speed-Mathem...5594888&sr=8-1