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Hello Akash,
It's good to know that you are looking forward to a career in software engineering. At the moment, you need to work really hard to secure a good percentage in your 10th and 12th board examinations. 75+ would be a decent percentage.
You need to understand the basics of physics, chemistry, mathematics and computers. This will help to increase your board examination percentage. Once you have entered the 11th standard, I would recommend you to join an engineering coaching institute. They will help you prepare yourself for engineering. They also conduct periodic tests which help you analyze your preparation level and you can study accordingly.
Once you've entered 11th standard, you should also solve various model test papers and competitive papers for AIEEE/IIT. Every time you complete a chapter of your 11th/12th syllabus, solve related IIT/AIEEE questions related to the chapter you completed. This will improve your knowledge on the chapter. Such competitive books are easily available in the market. This will also help you crack the various entrance examinations that you will appear for after passing 12th.
Ensure your percentage in class 12th is over 75 (at least 70). After you are done with your board examination, you should appear for the following entrance examination:
1. IIT JEE and IIT Advanced for admission into IITs.
2. AIEEE for admission into NITs and other government colleges.
3. Individual state examinations (OJEE for Odisha, COMEDK for Karnataka, EAMCET for Andhra Pradesh/Telangana etc.) for admission into private colleges in respective states.
The more the entrance examinations you appear for, the more options for colleges you will have for yourself.
Once you secure your position in a good college, ensure you maintain at least 70 percent throughout with no backlogs to be eligible for placement interviews in most companies.
I hope I have been able to answer your queries to your satisfaction.
If so, kindly upvote this answer. If you've any further questions, kindly revert.

This depends on individual's interest and other factors like, your field of graduation and your career prospects.
Major disciplines in MBA, you can look for are as follows:
1. Operations: It needs analytical knowledge with fair hands-on mathematics.
2. Finance: It needs basic knowledge of accounting and share, equity, credit-debit transactions.
3. Marketing: It deals with the promotion and advertising strategy to convince the target customers for your product.
4. HR: It requires good communication skills to deal with your team. You need to get the best out of your team and keep them motivated.
5. Mass communication: If you are interested in media and mass communication and have good speaking skills.
As you have completed graduation in agriculture, you will find operations/ supply chain in line with your graduation course. Though, most of it would need basic mathematics.