greetings,

following are the best institutes for UPSC coaching:

• rao study circle
• chanakya 
• nirvana ias academy
• nalanda ias academy
• vajirao institute
• vedanta academy

alone coahing is not enough. ample practice and self study is also very important. also read all the books from 6th grade onwards.

hope this helps.

good luck

hope this helps.

good luck