Please check below details provided by the officials -

AIEESE (PRIMARY) - The objectives of this exam are to take special measures to facilitate students from all over India to join the Government approved AIEESE (Primary) participating institutions along with scholarship programmes.

AIEESE (Secondary) - This is an examination for the students who aspire to pursue engineering in India. It is meant for those students, who have chosen engineering as their career and wish to pursue it from any of the IIT or NIT. This is one of the most desired examinations after JEE (Main) & JEE (Advanced) for engineering aspirants to study in any of the IIT / NIT on scholarship.

Good Luck!!!