how to direct approach to college for hiring student

hi all , i want to hire student from MBA Marketing , so which type of request or mail i send to college

Hello there,
Most of the colleges have placement cell and a in-charge for that who acts as placement officer, for any a student who need a job, he is the official contact for them, the same for any a company who requires freshers or interns; they must have to contact the placement officer and can submit their company profile and seek for off-campus interview date.
Most of the placement officers will come to corporate for jobs to their students, the same way you can also approach.

Abhimanyu
If you plan to conduct Campus Recruitment, call them and send mail to the Placement Office with specifications of the job.
You can mention details such as How many hires you need, What is the selection procedure, How many recruiters would be participating, What facilities you need etc.