Hii aspirant ,
In jee main paper 2 rank is calculated by taking 60 percent Marks of jee paper and 40 percent of board.
So it's difficult to predict score for 100 rank in sc category but still you have 80 percent in board they you must have to secure 250 above in 360 to get category rank under 100 and general tank arround 3k
For more information you can visit https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-rank-predictor/amp
Hope this helps!

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