IISC is the most reputed institue when it comes to science and research and it requires really good knowledge and marks to get into IISC.
Here is the admission process of IISC -
1.) After 12th std candidate has to give either KVPY, IIT -JEE, NEET in order to get selected for BSc-MSc dual degree programme.
2.) If you apply after Bsc then you have to give JAM OR JEST in order to get selected for I ntegrated Phd.
IISC has no Msc programme or Bsc programme.
One has to either take dual degree programme or Integrated Phd or Phd.
Thank you and all the best.