Hello student predicting exact cutt off is little difficult as it depends on many factors like the level of question in the entrance examination and total number of applicants in that examination. But if we go through past year cut offs then to get admission in aerospace engineering (B.tech) at IIST the opening rank for Genral category was 335 and the closing rank for Genral category was 4450.
To get admission into IIST candidates need to first qualify Jee main and jee advance. To appear in Jee main April examination you need to register for it. Application for jee main April examination starts from 07th of February and shall remain open till 07th of March 2020.
Eligibility - candidates must passed or appearing class 12 with physics chemistry and mathematics with minimum 75 percent marks aggregate from a recognized board

For more updates on IIST cutoff please refer to the link mentioned below.
https://www.google.com/amp/s/engineering.careers360.com/articles/iist-btech-cutoff/amp

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