what is the INT beneft in the game.  what i need it for ?

 

High gym gains tor battle stats.

You May gain 

0.5 strength at 30 50 int.

But after 1200 and some good stats

Its almost 10000 per energy.

Int ( intelligence ) both benefits your job success chances and your gym stats gains, just like happy + crime skills in torn.

But it is not recommend you to grind that in your first day, you should studying in Medical Degree till you have 50-70 int, before you actually grind it with your energy.

edit: add link