In order to become an IAS Officer, you must apply for CSE exam conducted by the UPSC. You must also crack the exam (preliminary, mains and interview) in order to get selected for the training.

The basic eligibility criteria required to appear for this exam is – candidate must possess Graduate Degree from a recognized University/Institute!

So technically, 12th passed students can’t appear for this exam right after 12th. After completing 12th, they must complete Graduation first. After completing Graduation program successfully, they may take a shot and CSE and become an IAS Officer subsequently.

Hello
There is as such no qualification needed to qualify IAS younjust need to complete your graduation from a recognized college or University.
The more early you start preparing more the chances you have to crack the exam on its first attempt.
Even if you prepare the aptitude tou would be able you clear other exams easily.