the last date of admission for du is 31 August but i am appearing for improvement exam which is even in September so how will i apply for du then??
Fill the form for DU and keep on preparing for it.
Also, for improvement exams you need to go through the old syllabus well and revise it.
For DU entrance keep some time away and you will be able to prepare well.
Although it might be tough but you will go through it well.
Good Luck!