IIST - Indian Institute of Space Science and Technology Thiruvananthapuram Answered Questions

The admission in IISST in B.Tech Aerospace Engineering are based on ranks obtained in JEE Advanced (Conducted among the JEE Main qualifiers). So Diploma engineering students are not eligible for admission here. However, if you have completed the 12th with PCM with minimum 75% of aggregate marks than can apply for JEE Main. After obtaining the minimum qualifying marks in JEE Main can be eligible for JEE Advanced.

IIT Bombay, IIT Kharagpur and IIST Trivandrum are offering B.Tech in aerospace engineering course. The admission in IITs and IIST are based on ranks obtained in JEE Advanced conducted among the JEE Mains qualifiers. Hence, first you have to qualify the JEE Main exam and then appear in JEE Advanced exam and obtained the minimum ranks as mentioned below:
IIT-B : 2082
IIT K : 3822
IIST : 11215
The best approach is to join any JEE preparation coaching institutes. Because more than 90% of students get selected in IITs are coming from the coaching centers.

The eligibility criteria for B.Tech Aerospace Engineering at IIST is given below:
(A) Eligibility criteria : Minimum Marks Requirement in Qualifying Examination: Candidates must have secured at least 75% aggregate marks in the Class XII (or equivalent see below for list of Qualifying Examinations) Board examination. The aggregate marks for SC, ST and PD candidates should be at least 65%. The marks scored in the following five subjects will be considered for calculating the aggregate marks:1. Physics2. Chemistry3. Mathematics4. A language (if the candidate has taken more than one language, then the language with the higher marks will be considered). Any subject other than the above four (the subject with the highest marks will be
considered).
(B) Minimum Marks Requirement in JEE (Advanced)2020 Examination: Candidates should have appeared for the Joint Entrance Examination (Main)-2020 conducted by National Testing Agency (NTA), to qualify themselves to appear for the Joint Entrance Examination (Advanced)-2020 conducted by IITs and secure the minimum prescribed marks by IIST.
So, from the above Diploma students are not eligible for this course.

The path which you are looking for is really appreciated. Regarding space and research Science courses and their fee structures, you can go through below link
https://www.shiksha.com/university/iist-indian-institute-of-space-science-and-technology-Thiruvananthapuram-25141
All the very best.

The admission in both (IIST& IIT) are based on ranks obtained in JEE Advanced (Conducted among the JEE Main qualifiers). Candidates who are desirous to join the Undergraduate and Dual Degree Programmes offered by IIST are required to apply separately to IIST through the online application portal (http://admission.iist.ac.in) and complete the registration and fee payment process. Further both IIST and IIT-B are premier institution of National importance, Hence no comparison can be made.