Urgent.....!!!!

Hiii i am appearing for ca final may 2015 examination...i have not started yet and filled 1st group..i am going to start studies as soon as possible to claim exemption in any subject...plz tell me which subject is most scoring and does nt take much time and DOESNT HAVE INTERLINKAGE WITH ANY OTHER SUBJECTS OF 1ST GROUP AND OTHER SUBJECTS OF 2ND GROUP as well as i have not studied anything of ca final as yet...is that subject suitable enough for self study(means doesnt require coaching)??which is the best book for self study for that subject in delhi??...dont tell i can go for whole group 1...and please also tell how much hours without break on an average does that subject take to do self study...?? plz answer asap,,, :)