Besides practice manual,suggested answers,rtp,mtp ,ICAI also provided the lessons in slides(in PDF format),download them,they help you a lot in quick revision. You can also listen the audio lectures for Adv Acc. Which helps you in scoring good marks. Try short notes for IT subject which is available in CA club India,it will help you to remember all the technical jargon.
Its very difficult to study in 2 months for CA Intermediate | CA IPCC. To pass CA Intermediate | CA IPCC you have to devote your time more than 2 months. There is not shortcut to pass the CA Intermediate | CA IPCC exams. However, I would advise to study from RTP practice manuals and suggested answers