Hello Farheen ,

The eligiblity criteria for biology , chemistry Olympiad given below :-

• Must be a India citizen.
• Not completed 12th board before Nov 2019 .
• Birth between 1July 1999 to 30 June 2005.
• Must not be appearing in NSEJS 2019.

The number of students select in each subject is announced before INO exam. Marks required for selection is around 35 for biology , chemistry, physics , junior science and 50 for astronomy.

Hope it helps!!!!