Be very careful! These days Careem and Uber are not generating good return. Driving 12-14 hours daily for return of maybe 2,000 rupees per day. Then add oil change and other expenses. Your income will be disappointing. Best you should start by becoming a driver (employee) of some vendor in Careem/Uber and experience yourself the tough duty and minimum earning of these apps. In 1 month if you still want to continue only then you should make investment in wagon R. future of careem/uber is uncertain because:
Govt. of Punjab has started crackdown against Careem and Uber. If you are caught by LTC, your car will be locked for 7 days. You will be fined 500 rupees every time you are caught.
Punjab assembly has received proposal to convert Careem/Uber into government company. So future is at risk.
I will sincerely advise you to seek other options. If you still want to drive, buy a slightly used good condition city/corolla and rent it out monthly to some hotel/multinational company, etc.
Still if you want to buy new WagonR, file your return with advice of competent legal advisor (it will cost you 2-3000 rupees) instead of asking strangers on internet who have no idea of your income, property, etc.