Exam

Get into one of the NIT's or IIIT's and your life will be successfully with that, along with your hardwork of course.
Moreover, best coding colleges are NIT trichy, Warangal, Surathkal, Rourkela, NIT Jamshedpur, IIIT - D, (IIIT-A and IIIT-H are highly recommended ). and The supremes are IIT's if yo

No, there is no such exam. Moreover, IIT-JEE is only held only for central government run institutions across the nation.

No exact answer can be given as admission in SASTRA is on the combined basis of boards and Mains score.
Since you have a low boards percentage, you can only get into it if you have good Mains marks.
However, the branch is non-core, hence the competition will not be much.

Firstly, you can go through the chapters which you thought you can easily deal with it and do more questions of it.
Then step by step, you can go to slightly tougher chapters.
It will increase your confidence.

Sorry to say but you still have 0.6% less marks than required. Try if you can send it for reevaluation or if something can be done regarding that. Best of luck.

Seems quite difficult as 190 is not a high rank score. Although you should try for it anyway either in another college.