Hello aspirant,

If you have taken admission in any college and want to pursue  IIST for under graduation, then you would need to take a dropout.

The selection in B.Tech and Dual (B.Tech. + M.S./M.Tech.) will be done through the score obtained in JEE Advanced and counseling.

So you need to prepare for JEE Advanced in order to get admission in IIST.

Best of luck.