Hello Himanshu!! Welcome back to CA course.
1. You registered yourself for IPCC 2010. Now you are asking for Amendments.
There are many changes in every subject not only in Tax, Law or Audit but also in Accounting, Advance Accounting, ITSM and CAFM.
In my view you should purchase latest books for every subject.
But don't worry all the concepts are similar. There are just some Amendments and few vhanges in course contents.
2. You are asking about Validation of your IPCC 2010 Registration.
Refer here for better understanding --> https://www.aubsp.com/2013/02/revised-scheme-of-revalidation-of-registration-for-ca-course.html
Rohit --> Indian CA Helpers Blog (a blog specially designed for CA IPC students)