Information Technology

Object-Oriented Programming has the following reasons to be used:
1) OOP provides a clear modular structure for programs.
2) OOP makes it easy to maintain and modify existing code.
3) OOP provides a good framework for code libraries where supplied software components can be easily adapted and modified by the programmer.
4) Code reusability.
5) It is suitable for real word problems and real world works.
Few more points for better understanding are:
Why? Because if you stick to the rules, it makes complex code easier to develop, reliable, maintainable, and generally better.
OOP insists that you think about what you expose to the outside world, it lets you change the implementation of an object without affecting any other code. (Encapsulation)
It allows you to have many different functions, all with the same name, all doing the same job, but on different data. (Polymorphism)
It lets you write a set of functions then expand them in the different directions without changing or copying them in any way. (Inheritance).

As you have asked to tell about how to do MBA without any entrance exam. Yes, you can do an MBA through distance learning or a correspondence from any of these colleges distance learning programme. Sikkim Manipal University, XLRI Management Institute-Jamshedpur, FMS (Faculty of Management Studies), ISB (Indian School of Business-Hyderabad), SPJIMR, SP Jain Institute of Management and Research, IMT (Institute of Management Technology-Ghaziabad), Nirma Institute of Management-Ahmedabad, IRMA (Institute of Rural Management), Anand, XIMB (Xavier Institute of Management Bhubaneshwar), Amity Business School-Noida, LIBA (Loyola Institute of Business Administration), JRE Group of Institutions, Maharishi Dayanand University and Kurukshetra University.
Best of luck.

In order to pursue a science course at any of these colleges, they will have to appear for an entrance. Some popular B.Sc and M.Sc entrance exams that science aspirants should consider giving in order to secure admission in a good college. Are mentioned at the link provided below:
https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484
Which course is better? The career opportunities for both these graduates are many. But most MNCs prefer MCA graduates to M.Sc graduates. This is because the MCA graduates are well aware of the software applications. But for developing new software, M.Sc graduates are preferred. MCAs are most suitable for the working purposes in various companies. While considering a bright career, MCA course will be better than M.Sc in computer science.
Regards.

You should pursue a course which you feel comfortable doing/studying, and where your interests lie. The career scope for students of IT is on the rise today. Employment opportunities that offer lucrative salaries are available to desirable candidates. The degree in B.Sc information technology serves as a very good base for students who wish to pursue their career or advanced studies in the field of information technology.
In comparison, if you pursue BCA you have a good chance of getting a job after the course, however, you will be in a lower pay grade. For better prospects, you might have to pursue an MCA. In my opinion, if computers is your strong point you should pursue BCA and if general science is your forte, pursue B.Sc. The choice is yours. Good luck!