My wife is working, how can i get proof

you can ask the court to summon the employer to produce the proofs regarding wifes employment

Dear Khush, '

Summoning to employer will be waste to time and i am sure she has done the setting with her employer and employee is not bound to say truth in court, Hire the detective , or court commissioner to do the job on ur behalf. 

send your relatives friend to take admision in the college query and ask him/; her to meet your wife -faculty and she will sign the paper or write her name during counseling and submitt the same in court. Check college website faculty session to see whether she exist in the group photo.. 

Agreed with Anshul Sharma.

Further first you should be sure by visiting that place regarding her job (not by as you mentioned unauthorised source) and then you should make an application for appointment of Local Commissioner in same court.

Thank You;

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