B.Sc

Hi Anushka! You can get the previous year problems and sample papers for B.Sc. B.Ed integrated course from the nearby markets. Also, you can buy it from amazon or flipcart via online shopping. Apart from these all try to solve some online mock tests as well.
Best of luck.

The average course fee ranges from INR 8,000 to 30,000 per year.

You can check the below link for list of colleges offering Bachelors of Science. You can check the specialisation offered, fees, rating
https://www.shiksha.com/science/colleges/b-sc-colleges-Chennai.

You can apply online with required information. Admission is based on the marks obtained in 10+2.

Please refer to the link provided below for details regarding admissions in IHM, Catering and Nutrition, Delhi for B.Sc in hospitality and hotel administration. You should be able to download their brochure which contains details regarding application dates, entrance exams(if any), forms, fee structures, courses eligibility, etc.
https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/course/b-sc-in-hospitality-and-hotel-administration-institute-of-hotel-management-catering-and-nutrition-delhi-library-avenue-pusa-90908

There are three subjects namely quantitative ability, data interpretation and verbal. Also, GK for a few examinations.

The aptitude test generally consists of 4 sections: Quantitative aptitude test, logical reasoning, English language and general knowledge. Also, you should be well aware about media and journalism in Indian scenario and read a newspaper daily for current affairs.

Placements for courses like Statistics, Economics and Mathematics are quite appreciable in the University of Delhi. However, you need to have the required skills to get selected.

Hi Debmoy!
As you are appearing class 12th via NIOS. Don't worry. You can definitely apply for the B.Sc. (gaming). Just prepare well for your 12th.
Best of luck.

Yes
10+2 with Physics, Chemistry, Maths students can apply for B.Sc.