ICAI has officially released the list of applicable editions of Practice Manuals for May 2018 exams.
Some of these PMs may not have updated amendments, so you are required to study them along with RTP.
Except for Information Technology and Taxation, for all other subjects, April 2016 Edition will apply.
For Information Technology, June 2017 edition shall be applicable.
For Law, also read the Supplementary Material released June 2017, that is hosted on ICAI Website
For Taxation, the new Study Materials released for New Syllabus students will be applicable for Old students too, which means a Practice Manual will not be released for this Subject.
Note : This announcement is about applicable PM editions and it has nothing to do with Question Banks to be released for Tax.
PM and Question Bank are not one and the same.