hi,

see first of all I want to correct you that CAT i.e common admission test is for Management program entrance test. this is not a design entrance test. so in case you are not interested for MBA, you would not need to appear for CAT.

seed stands for  Symbiosis Institute of Design (SID), Pune , this exam is bachelors level admission. so you need not appear for seed exam as well.

AIEED i.e All India Entrance Examination for Design (AIEED) condducts by Arch College of Design and Business, which you are eligible to apply for pg course in design.

NID i.e national institute of design, entrance exam which you are eligible to apply.

CEED 2021 is a national level entrance examination conducted by IIT Bombay for admission to Master of Design (M.Des) and PhD (Design). you are also eligible to apply for it.