Hello Palash

IISER admissions are conducted through three channels- JEE, KVPY and SCB.
Candidates opting for the SCB channel will have to appear for the Aptitude test. IISER Aptitude test is a computer based test and the duration of the test is three hours.

Exam Pattern is as follows-
Exam would be conducted in Computer Based mode and multiple choice questions will be asked in the exam.
Total number of questions is 60. In the exam, three marks will be awarded for every correct answer and one mark will be deducted for every incorrect response.
Go through the link below to check the detailed exam pattern, syllabus and you can also download the sample papers. Through sample papers you can have an idea about the type of questions asked in the exam

https://engineering.careers360.com/articles/iiser-syllabus-exam-pattern

Good Luck!

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