As per my view you should refer J.B. Gupta Sir book with the powerpoint presentations provided by J.B. Gupta sir on www.jbguptaclasses.com. this combintaion will help you a lot. An another benefit to refer J.B. Gupta Sir book is the FULL HELP OF J.B. GUPTA SIR you can call him at any time for any problem he never say no.