Hello,
You can register for the cbse 2020 improvement examination as soon as the improvement application form rolls out. You can het information about the same by browsing through the official website. Fill the form with utmost accuracy . Put correct combination of your roll number, school number , centre number.
A region will be automatically generate as per the current residence guided by the cbse norms.make sure that you correctly fill the subject code  and medium. You need to upload scanned copy of your photograph and signature. You also need to choose a bank where you will deposit the required fee. Final step of the application form would be the submission of the confirmation page. The applicant must sign the confirmation page. After paying the fee, print out of the confirmation page,  copy of marksheet , along with proof of deposted fee should be sent to  regional officer , cbse regional office as per the given address.
Make sure that you keep visiting the official site to keep yourself updated about all the necessary information.
Hope this helps
Good luck

Hello dear student,
Greetings,
YES you are eligible for improvement exam 2020.
You can register online for it , form will be available on cbse 's official site.
CBSE Improvement Exam Application Form:23rd October 2020.
Form submission last date without late fee:17th Novermber 2020.
Confirmation letter Issue by CBSE (by post):February 2020.
CBSE Improvement Exam 2020 Admit Cards:February 2020
.Exam will be held on:March 2020
GOOD LUCK
THANKYOU