Hello, 

A career as an IAS officer is a very good choice. You do not need to do a medical course graduation to be eligible for the civil Services exam. Still if you would like to be a medical graduate then you can go ahead with this decision. You should give the NEET UG examination and score atleast more than 550 marks for a secure admission in MBBS course in any college in India. For this Examination you need to study NCERT textbooks thoroughly. Along with NCERT books you also need to solve previous year's question papers and mock tests for proper time management practice and to get an idea about the exam pattern.  

For cracking the NEET exam with a good score you need to prepare properly and do not loose hope about getting good marks. Be confident about your preparation and you will definitely crack the exam in one year to get a medical seat.

Hope this helps.

Good Luck.