A Permanent Commission means a career in the Army till you retire. For a Permanent commission you have to join the National Defence Academy or the Indian Military Academy.
The National Defence Academy, Pune

Apart from providing graduation degrees, NDA has the finest infrastructure for professional training. You'll find phenomenal opportunities to develop your personality and cultivate new interests.
There are 31 extra-curricular activities to choose from. You have aero-modeling, golf, gliding, sailing, wind surfing, astronomy, photography and many more.
Indian Military Academy, Dehradun

The IMA trains you to lead from the front. You are trained in all aspects of combat and tactics using technology and other modern tools and technologies.
The IMA has excellent facilities for all-round development. You can go for adventure sports like river rafting, Para jumping, rock climbing, trekking and mountaineering.
From the IMA, you're commissioned as a "Lieutenant" in the Indian Army, to go out into the world and live up to the IMA motto - "Valour & Wisdom".
Officer Training Academy, Gaya
Once selected for 10+2 Tech entry scheme, you go to the Officers Training Academy, at Gaya. After passing your 12th Exams with subjects Physics, Chemistry and Maths and appeared in JEE Mains you can apply, clear the SSB, be medically fit and join OTA Gaya as a Direct Entry if you come in merit. The basic training of one year is held at OTA, Gaya and thereafter four years training at concerned CTWS.
For more information Click here