CS Executive programme query

Hello friends..i'm appearing for CS executive programme 2nd group exam nxt month end..i had passed the 1st group in june 10 attempt..but now the preparations are bad because i'm subjected to out audit for the past 2 months,not finding time to study..i heard from my friends that there is a book called "THIS MUCH ONLY"..where we find main points for each subjects in 1 book..will that work out..will that be enough to pass the group..please give your valuable suggesstions.....