Hello the marks may vary on several factors depending on the percentage of students applying for the exam Students who have passed 10+2 level with science stream in 2018 or 2019 are eligible to apply for admissions and appear for IAT 2019. However, they will be considered for admissions to the degree programmes only if they obtain the cut-off marks specified for their board. Please see the cut-off criteria here. Students applying through SCB channel will have to appear in the IISER Aptitude Test (IAT) which will be conducted at various centres across the country. IISER Aptitude Test (IAT) 2019 will be conducted in a fully computer-based test mode. CBSE cutoff is 92% .The listed out cutoff percentage is for the students who belong to general category, 5% relaxation is given to the students who belong to OBC, and generally, 50%-55% is the cut off for the students who belong to SC/ST or PWD category.