Tution fee income is your income from business & Profession therefore ITR 4 (assuming entity is not P'ship firm or Company)
if your business size is small or is in idol capacity then u can treat it as OTHER SOURCE income then ITR 1 can be filled Provided u dont have any capital gain income or u dont have more than one house property if u have capital gain income or more than one property then ITR 2
ITR 4S is only for small Business where the total sales/turnover/gross recipts (business) is .
upto Rs 60 Lack
Income from such business is calculated on Presumtive basis i.e 8% of total sales/Turnover/Gross recipts from BUSINESS & no further expensess can be claim U/S 30 to 43 except remunaration to partner in case of P'ship firm
It is also applicable to sec 44AE,44B,44BBA presumtive income