BOOK FOR SFM: PATTABHI RAM OR SRIDHAR ???

I am appearing for CA final in may 2016. I have taken coaching for sfm & completed 3 readings from coaching notes but still I am not able to solve sums and there is much difference between coaching solutions & pm solutions. Can I change my book now? For 3 chapters specially FOREX, DERIVATIVES & SECURITY ANALYSIS. Please guide me. Which book I should refer? 🙏🙏🙏🙏 and is pm sufficient for theory.            I need a book which explains concept and problem on that concept. I have checked AN SRIDHAR book but it has theory all together & then problem back that too directly of pm and not understanding concepts. Please help me. 🙏 thank you

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