Dear CS Professional Student,
CS JUNE 2018 Tax Exams will have questions from GST ACT & RULES along with Direct Tax as amended by Finance Act 2017 for FY 2017-18 & Customs as amended upto 30th Nov, 2017 in this relation ICSI has released the updated TAX - Book which can be downloaded from the following link:
Advanced Tax Laws & Practice - JUNE 2018 - Updated Book
All the Best !
CS Rahul Harsh