hello aspirant,

After 10th,you have to take any group in class 11. After Intermediate,you have to complete your graduation (Any degree). After 3-4 years of degree, (If you want) you can take coaching for an IAS for 1 year. After coaching,You have to write an exams (I.e.prelims,mains).

You just need to know is only the UPSC syllabus. The main strategy required is consistency and note making. You can start ur preparation from any class even 10th. Which stream or degree u will choose further, it doesn't matter. U just need ur self alertness preparation everyday. Even 2 hours of everyday r enough for this. Newspaper reading should be the important part of ur life if u really want to crack it. The foremost thing u should note is ur time management. Besides ur UPSC preparation u should stay focused towards ur regular classes study also. U should be awared time to time about international interests as well as relations.

Further, to know more information about how to become IAS , UPSC Exam, etc, you can follow the  below mentioned link to know more : https://www.careers360.com/careers/ias-officer

I hope that this will help