i gave my iit uceed 2020 exam yesterday but i forgot to click on mark as attempted button for drawing part though i have attempted the question on paper.so what should i do now.
You can't change it if once it is submitted. there is no way to change it now. You will get your score from the part you have answered and submitted. Next time don't repeat this mistake and keep in mind that if once got finally submitted then you can't change it. So keep some buffer time to check what you have attended and which part you have submitted or kept for review.
Hope it helps!