Hi Aspirant

To prepare for civil services you must be very serious because you are going to prepare for one of the toughest exams.

Find out the official syllabus.

You must know every details of the exam like it has 2 phases :

1.PT

2.Mains

Then what to prepare for PT and What to prepare for mains.

After completing your graduation you will be eligible to appear for the exam.

Few online resourses are:

1.Vision IAS (online as well offline is available)

2.Unacdemy (The most famous for online preparation)

3.MRUNAL (youtube channel:one of the best for economics portion)

you can watch interview of previous year passout/topper on youtube which can help you to understand everything exam,exam patterns,good books,

what to do and what not.

All of these will be really helpful.

Good luck