Software Engineering

Start learning C, C+ or java.or can start either with C or C+. There are several video lecturers available on YouTube if you are not comfortable with textbooks and it really doesn't matter that you should first join college and then start learning software languages. There are several students I know who are mastered in this field before joining college. But it really takes serious dedication with lots of frustration.
Try to practice on coding websites like HackerEarth or HackerRank then you will learn how to practically implement your codes.
Have some basic knowledge of computer Architecture, like how it works, how data or instructions flow. It's also available on YouTube.
There is not only one field to learn in software Engineering, if you are pursuing your B.Tech degree, you must have known about this, if not u will. New sectors are emerging day by day, but the concepts do not change.
Language changes like people now switching from php to django.
So you should learn at least 9-10 languages (doesn't matter if u are mastered or not) but you must master at least one language, and that's the key to be a programmer and hence Software Engineer.
It's all about programming and coding.

Hello Ashu,
Software engineering is the application of engineering to software that includes documenting the requirements of the software through application of basic design principles. Software engineers also learn to analyze and design alternatives keeping in mind the utility of the finished product and whether the final product meets its requirements. At the same time they are also trained to realize the safety, reliability, cost-affectivity and functional aspects of the software.
Software engineers learn to research, devise, experiment and maintain software systems as per the requirements of the client. They are well-versed in computer programming languages and applications.
You can join small and large-scale business establishments, government agencies, and non-profit organizations as full-time employees, on contract basis or even as freelancers. One can expect various roles in an organization that include analysts, architects, developers, testers, technical support, managers and also researchers.
Core Subjects:
1)Mathematics
2)Chemistry
3)Basic Engineering
4)Computer Literacy
5)Physics Laboratory
6)Engineering Graphics
7)Biology for Engineering
8)Principles of Environmental Science
9)Material Science
10)Digital Computer Fundamentals
11)Computer Organization and Architecture
12)Data Structures and Algorithms
13)Software Engineering Principles
14)Object Oriented Programming
15)Microprocessors
16)Software Design
17)Computer Skills
18)Discrete Mathematics
19)Computer Networks
20)Industrial management and economics
21)Software quality management
22)Web technology
All the best.