Hello,
If you have failed class 12 the previous time and are giving improvement exam this year, then you should consider NEW details to fill any form.
The situation is like this that the previous year will not exist in your records. You applied for a fresh exam and you will seek admission for higher studies basing on your IMPROVEMENT exam credentials only.
So, fill IMPROVEMENT exam roll number and passing year as 2020. In the status, you can fill APPEARING FOR CLASS 12 exams.
Hope this helps.
Thanks.
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