self study strategy
1-KNOW THE STRUCTURE OF THE EXAM
2-UNDERSTAND THE COMPLETE SYLLABUS
3-PREPARATION OF OPTIONAL
4-PREPARATION OF GENERAL STUDIES
5-ENROLL YOURSELF IN A TEST SERIES
6-GO THROUGH PREVIOUS YEAR QUESTION PAPERS
You need to join in a best IAS coaching institute and now recently clear my prelim exam, that moment was heartwarming..I always follow this strategy.