Honestly, there is no requirement of coaching for clearing ias exams, but if you think you require extra guidance and desire to prepare for the ias exam with proper strategies then coaching joining becomes a must. The following are the list of the top 5 ias institutes in India as per my best knowledge, it offers high quality and its worth the money spent on availing there coaching
1. Rau’s IAS Study Circle
2. Sriram IAS
3. Vajiram & Ravi
4. Vision IAS
5. ALS IAS