Indian Institute Of Space Science & Technology

Please name the course with specialization for better understanding. Selection Procedure in general:
Citizenship: Only Indian citizens are eligible to apply for admission in IIST. Date of Birth: Candidates belonging to General category (GEN) and Other Backward Classes (OBC) categories must have been born on or after October 1, 1992. Candidates belonging to Scheduled Caste (SC), Scheduled Tribes (ST) and Persons with Disabilities (PD) categories must have born on or after October 1, 1987. Qualifying Examination (10+2 or Equivalent): Must have secured at least 75% aggregate marks in the Class XII (equivalent) Board examination. The aggregate marks for SC, ST and Candidates should be at least 65%. Marks scored in JEE (Advanced)-2017 Examination: Candidates who are desirous to join B.Tech. Programmes in IIST must appear for the Joint Entrance Examination (Main)-2017 conducted by Central Board of Secondary Education (CBSE), New Delhi to qualify themselves to appear for Joint Entrance Examination (Advanced)-2017 conducted by IITs and secure the minimum prescribed category-wise marks in.

None of them answered your question correct. So, at first about the placement: No IIT's have got 100% placement but only those opt for campus placement which is around 60%-70% of the total eligible candidates. So, you can't be placed if you don't opt. So, I don't see a problem in placement in IIT here. So, don't believe those misinterpreted placement statistics in your newspaper. (Note: My words are coming from the official placement data published by IIT Bombay.)
Now, about IIT or IIST. You should go to IIT, if you wish to continue your study and do M.Tech or Ph.D, as when you apply for higher studies the IIT name will give you an edge all over the world. I know that IIT's don't have good ranking on those lists but trust me people know and admire them. Now, if you want to do job after B.Tech then IIST is better as you get a job in ISRO/DRDO directly but bear in mind that only those who score best in all 8 semesters will get a job with more than I7.5 GPA in each semester, which means that just getting more that 7.5 GPA won't ensure you that job, and if you score less than 7.5 GPA you are not eligible. Hope it helps and that I cleared all the doubts and wrong answers which were given. If not then ask your question in comment section. And best of luck for your future.