Hey Aspirant,

BSc CS students can't write the IIT jam exam.

It is conducted only for following subjects

• Biological Sciences (BL)
• Biotechnology (BT)
• Chemistry (CY)
• Geology (GG)
• Mathematics (MA)
• Mathematical Statistics (MS)
• Physics (PH)

You are eligible for jest which gives a successful career in IISc institute far better than iits in research field. There are some other institutes like IISER, BITs giving you M.SC academics.