Government & Defence Entrance Exam

You can appear for SSC CHSL. It is conducted for 12th pass students. You can also give SSC JE exams after completing Diploma.

B.A. In history would help in your dream of becoming an IAS Officer. The idea here is to choose a Stream that helps you to prepare for IAS too. B.A. In History should help as IAS exam usually asks a lot of history questions. You can also pursue BA+LLB for same reason. You could pursue B.Sc. If you want but that won't help as much.

Previous year question papers are generally compiled into a book by publishers and sold on book stalls. You can very easily find one at your the nearest book stall.

By start studying today. Dedicate 7-8 hours of a day on studies. Join a coaching. Practice sample papers and keep giving same level exams to test yourself. Keep in mind there is no other option than working hard for the civil services.

It depends on where you are at now. For an average student completely dedicated towards it, it will take nearly 2 years with the help of coaching.

The cut-off is usually at near 150. It changes each year depending on the number of candidates applied.

Only through NDA. But you will have to answer mathematics questions along with general Science to qualify.

No, you do not fall within the accepted criteria to be called for interview on the basis of merit. Usually, it is above 85%. .

Applications from 10+2 exam pass candidates for the Technical Entry Scheme (TES) 40 Course January 2019 for the Grant of Permanent Commission. Eligible and interested male candidates can apply online from May 16, 2018, to June 14, 2018.

You can apply for exam in the last year. But, you should start preparation as soon as possible. You can start it from right the moment now so that you will cover lots of knowledge. Hope this will help you.
Good luck.