old syllabus preparation

"I also want to ask that giving exam in may 2018 is opportunity or not"

Yes sir. Of course it is. There is no doubt about it. Prepare well and appear for the exam. Never skip an attempt.

For your other question on how to prepare - This link here has several answers to this question.

Good luck!

Never ever skip exam. If you are doubtful that you cant prepare well for both group, then prepare for single group thoroughly & just for passing in other group.

You can also prepare for exemption in 2 or 3 subjects.

Even you dont do anything then also you have to attempt exam because it gives you confidence.