Vinod gupta or vinod singhania???? dt final - nov 13

I used Vinod Singhania for May 13 exams and got 44 marks...Lost Grp2 bcos of ISCA. I feel Vinod Singhania is not that much good for revising before exams especially assessment procedures. I heard of Vinod Gupta's modules...Should I buy them for Nov 13 exams or continue with Singhania book? Is Vinod Gupta's book equally good when compared to Singhania? Can i read it in short span of time? Is it good for revision? Pls help...Thanks in advance