Banaras Hindu University

Hi Tanu Priya,
You need to appear for BHU PET to be eligible to take M.Sc in Food Science and Technology in Banaras Hindu University.
Please click below for details related to M.Sc in Food Science and Technology from Banaras Hindu University.
https://www.shiksha.com/science/course/m-sc-in-food-science-and-technology-banaras-hindu-university-varanasi-272597
Also, check out the registration process as below:
Admissions
Admission is done through counselling based on the rank obtained in Banaras Hindu University Postgraduate Entrance Test (BHU-PET) conducted by the university.
Important Dates
Jun 2018
Jun 15 - 20, 2018 BHU PET - Results
Jun 18 - 20, 2018 BHU PET - Results
Jul 2018
Jul 4 , 2018 BHU PET-Counselling: Start Date.

You need to focus on the syllabus of exam for class 12th, you just appeared. There are 150 questions comprising of 50 from each P, C&M concluding to a maximum mark of 450. If you are good at scoring 222, you'll get BHU.
Prepare well, solve questions and also theoretical questions in Science field and you'll make it to BHU. There's no need to go beyond the syllabus, what is asked in board exams for class 12th, and if you need more assistance you can purchase an entrance book which comes in cover as BHU UETB. Sc. Math entrance by any of the publication. You can also search the papers of last year entrance exams which are availed on bhuonline.in