Read more about civil services Find out about the life of a civil servant or a diplomat Talk to an IAS officer if possible Ask yourself, is this what you really want?
Take an undergraduate course which includes History and Politics These subjects are of utmost importance for UPSC syllabus. Study these subjects thoroughly keeping in mind the UPSC syllabus during graduation.
If you want to master these subjects, you can also choose any one of these as your optional subject. Check the success rate of optional subjects in UPSC.
Also, start reading Public Administration, Economics etc. You can also study these subjects as your main subject depending on your interest and aptitude.
Do not lose touch with the basic maths you have learned in school. It is required for CSAT paper in IAS Prelims. Read more about IAS exam pattern.
Make a habit of reading daily newspaper and be aware of the latest happenings in the country and the world. You can follow Daily News to prepare for current affairs.
Don't throw away your school NCERT textbooks these are the basic books to study for UPSC exam as well as take help from your college books.