Hello Aman. You mentioned you have scored 105 in JEE Advanced 2021 and that you belong to OBC-NCL category. Based on your marks, your Overall Rank may end up somewhere around 17001 and 18000 while your Category Rank may end up around 4,256 although it is hard to be predicted exactly as it depends on number of candidates appeared who belong to the same category as yours, difficulty of the paper, cutoff marks etc.

Based on your performance in JEE Advanced 2021, you may get admission to Aerospace Engineering at IIST, Thiruvananthapuram as your percentage appears to be 28.68.

in 2019, JEE Advanced Cutoff Percentage for admission to Aerospace Engineering at IIST, Thiruvananthapuram for OBC-NCL candidates was 29.30.

To know more about JEE Advanced cutoffs based on previous years' data, check out this article:

https://engineering.careers360.com/articles/jee-advanced-cutoff

To know your chances of getting into Indian Institutes of Technologies, to analyze and identify the best colleges & courses you can get based on your rank for Engineering, to get your JEE Advanced personalised report delivered on mail as well as to check course & counselling-round wise cut-offs of JEE Advanced for various seat types, caste groups, etc., I encourage you to use JEE Advanced 2021 College Predictor:

https://engineering.careers360.com/jee-advanced-college-predictor?utm_source=qna&utm_medium=jee_adv_cp

I hope this information helps you. I wish you all the best for your future and career.

Thank you.