I guess, you have to make at-least one sincere attempt to crack NEET to make your father feel happy.
Thereafter you can always do what you like the most.
Otherwise, you may not even know how much potential you have in competing with other students across India.
NEET will give you an yardstick of your dedication, knowledge and sincere efforts in making a success.
If you are successful in NEET, this may boost your confidence as well in thinking further on Startups.
Who knows, while you are preparing for NEET, you may also stumble upon and get an excellent idea for your start-up