You might not be eligible to apply for the IPMAT exam. Because the age elgibility criteria of the IPMAT 2020 exam is that the candidate's maximum age should be 20 years on or before 1st of August 2020. And I guess you have finished your 20 years of age this year already. But this is a rule for general category. If you belong to SC ST OR PWD reservation category then the maximum age limit is 25 years of age.

To know the elibility criterias of the IPMAT exam in detail, kindly refer to the following link..

https://bschool.careers360.com/articles/ipmat-eligibility-criteria

Best wishes. Thank you.