@breakbeat
Since you hold an Indian DGCA license the only ATPL subjects you have to give are
1. Air Navigation
2. Meteorology
3. Radio Aids and Instrumentation
Tech general , Specific and regs you dont have to give because you hold and Indian DGCA license and the syllabus for the ATPL and CPL exams are the same
This document should clear all your doubts
http://dgca.nic.in/forms/crew-d/atpl_aR.pdf
Word of caution ****
For the Subjects Air Nav and Radio Aids you have to give and oral . You have to obtain 70% in both the written and oral exam to be considered as passed .
For eg : If you get 90/90 in the written exam and 6/10 in the oral exam for a total of 96/100 you will be considered failed because you need a min 7/10 in the orals .
Once you pass the written exam you will have 3 attempts at passing the oral exam . If you dont pass in 3 attempts you will have to give the written exam allover again .
After you pass the written exam they will automatically schedule you for the oral exam . If you dont appear for it , then they will count that as a failed attempt and subtract it from the 3 attempts for the oral exam .
From then on you can schedule your oral exam anytime you please . But you will have to pass the oral exam within 24 or 30 months ( not sure ) from the date of passing the written exam . Otherwise you will have to give the written exam again .