What is the relation between comedk and pssat test

There's no relation between these two exams.Comedk is conducted to given admission in the colleges if karnataka and pessat is conducted to give admission in pes university.Through comedk you can get admission in colleges like RVCE,BMSCE,MSRIT,PESIT,BIT,BMSIT,..and many more.
So if you want to take admission in the above mentioned colleges you can apply for comedk and pessat.
Good luck.

PESSAT entrance exam is conducted by PES University & COMEDK is a state level exam It provides the admission to the candidates in the participating engineering institutes located in Karnataka. You can check the complete detail of the exams with given below links.

PESSAT

COMED K UGET

Good Luck!