Hello Mera,

Hope you are doing good.

See, fresh marksheet, with the revised marks, will be issued on clearing the exam . No passing certificate is issued as the previous year's passing certificate remains valid. In case the marks scored in the Improvement exam are lesser than the regular Board exam marks, the best of the both exams will be considered.

It affect your main marksheet or results. But ,

If a student does not 'improve' his marks in the Improvement exam, then he/she will have to produce both – regular 12 ^th boards and Improvement exam mark sheets wherever required. And as per the latest update of CBSE officials your improvement marks will be considered as final marks. But you can just confirm the same from your school official they can just guide you.

And you can get your main marksheet  you can send an application regarding this to the board officials, I don't think school teachers can help you with this because your board marksheet is given by the main CBSE board of Delhi. But yes you can ask them about this.

Hopefully this will give you an idea.

Best wishes.