Which itr applicable.

Dear Sir, My brother is a private company employee. He received his salary in cash Rs. 10,500 /- p.m. No form 16 given by employer. I mean to say that no salary proof available at him as cash received. Company denied to give any proof of salary. So, he can't show his salary income. Now he wants to make a IT file for a.y 2017-18 by showing this income as Tution fees. So, which ITR should he file. Now he will file first time so any assessment will make from department. Please guide me anyone.