Yes, there are substantial changes in FR, Law, IDT, DT and some minor changes in Audit and SFM. What you can do is download all the supplementary study materials and RTP ICAI has issued since May,2016.
FR
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- Ind AS in this May 2017 attempt had a huge weightage so you need to have more than working knowledge on carve outs and applicability
- Changes in existing AS: AS 6 and AS 10 have been merged in new AS 10 and consequential but small changes are in AS2,4 etc
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LAW
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- New act is applicable for Compromises and arrangements, Prevention of oppression and mismanagement, Winding up so better buy a new book.
- Even in FEMA lot of changes are there and don’t forget SARFAESI and addition of Insolvency Act for this attempt.
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SFM
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- Changes are in Forex chapter mainly and it’s about extension or cancellation of forward agreements
- New questions are also added in each chapter via a supplementary material book.
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AUDIT
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- New standards are now made applicable
- SEBI LODR guidelines are now applicable
- CARO 2016 Is Now Applicable.
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IDT
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Finance act 2016 with addition to Overview of GST.
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DT
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Changes with A/Y 2016-17 are applicable
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As you can see major changes are there in above mentioned subjects please go through the supplementary study materials and RTP ICAI has issued and choose a new text book appropriately