Class 11

Clear your basics. Prepare from NCERT textbooks. Make a timetable and follow it without any fail.

It depends on your location. So, make sure you go to the right person about the school.

Yes, you can. Just do apply the right time. Most of the good school start their admission process like form filling early like in January. Don't worry, just get admission in any school affiliated to CBSE and rest depends on your smart work. Be humble and be smart.
Good luck.

Hi Abdulla Jeelani,
You may continue your education from the same school, however, you can check the details here:
https://www.shiksha.com/aviation/flying-pilot-training/articles/career-in-commercial-flying-all-you-need-to-know-blogId-13472

You must have Physics, Mathematics as a basic subject with computer Science. And, you must also be good in operating the system, because it helps in you designing the aircrafts. Physics is the main and essential subject for the AE.

Yes, there is no rule stated as such saying that you can't change the board after class 10th. But it would be a little tough for your kid, as state boards are a little but tougher than CBSE.

Hi Riti,
It depends mainly upon you school and school's students. In case more than 50% of students of your school want science then priority is given to more scorer. Moreover, it also depends upon vacancies for intake of science students in class 11th. In any case I think getting above 85% will land you.

Dear friend,
As per my opinion and knowledge, you must pursue Polytechnic. It has a lot of scope and after completing this course, you can also go for B.Tech. And you can easily get a good job.

Yes, because CSE course starts from the basic only. Most of the CS students are from PCM/PCB/PCBM. So, don't worry about it. All the best.

Don't worry on your class 11th marks. If you select CS after class 12 then, you will be definitely succeed in that. But, for that you should learn more and more, and do more practice on coding skills in different computer languages. Like c, c+, Java, html etc.