Yes, you can appear for the IISER Admission Test in 2021. However, you have another route to IISERs via JEE Advanced Exam. IISERs after IISc Bangalore are some of the best Institutes for Scientific Research and Development and have excellent faculty, infrastructure and research facilities.

To know more about IISER Entrance Test do follow the link below

https://engineering.careers360.com/articles/iiser-admission