when I should apply for IISER SCB aptitude test I am appearing board exam in March 2020 ?
You are currently in 12th class but eligibility for IISER SCB examination says firstly you need to complete your class 12th examination with a minimum cut off marks as per the respective boards which is 75% for CBSE board so you can apply for it after the completion of your 12th examination and when you will score eligible percentage.
I hope you got it.
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Best of luck.