Old syllabus applicability for may 2018 exams

Hi all , 

Can anyone please tell me in detail what is applicable for this coming may 2018 exam , as i am writing ca ipcc inter group 1 registered under old syllabus i just want have a clarity of each subject about it's changes and what exactly i shoud prepare for in each subject . 

As per tax I heard GST is applicable if yes is it fully applicable ? Do I have to again purchase my Taxation PM and SM for may 2018 ? and what are other changes and new books to be bought for may 2018 exams?

Thank you.