Government & Defence Entrance Exam

No graduation is required. You should also get 50 percent minimum in graduation for writing Civil service.

Even I also scored 70% in PCM and dropped 1 year for preparing NDA as well as class 12th improvement. Wasting a year for preparing NDA is a bad idea. I myself have done this that's why it is quite a personal like question for me. Go on your with your studies. As at SSB, I found many aspirant were either just done their class 12th or in 1st year of their higher studies and 2 months are enough for preparing NDA that's why at most of NDA preparing coaching you'll find max crowd is just 2 months before exam. By the way having 70% is quite good and with this marks you can sit in most of the exams in India. TES as well.

For IAS, it's not necessary that you have to choose any one particular stream. It only requires graduation from a recognised university. It's Indian Engineering Services that you require some specific engineering branches which are Electrical, Mechanical, Civil and Electronics and here computer Science does not come under IES. For IAS if you are a graduate that will be enough to appear.

For IAS exams, BA is a good option, because it covers almost all the subjects and syllabus for Preliminary exams i.e. CSAT and Mains. Although, questions from Science and Maths are also been asked, but they can be prepared as the course is not much wide. During your BA course, you can prepare for IAS simultaneously.

To become an IAS officer, you can select any stream in which you are good and you have interest. To clear UPSC exams, you have to prepare well from the beginning of your graduation itself. This is one of the toughest exams of India. Just choose your stream according to your interest and in which you are best.

Hello Sangam, Congratulations. You have already won half the battle by choosing your aim in life. The rest is only mundane. Fundamentally, civil services requires you to be a graduate in any discipline and checks your knowledge and analytical ability in your chosen subject. Hence I would advise you to choose a sub that fascinates you. Study well and success will be yours.