DTU - Delhi Technological University

You have to appear for entrance DTU CET. There are 33 seats there must be screening. Since you have excellent academic record, it would definitely be beneficial to go for the entrance. Go to the website for course details:
http://www.dtu.ac.in/

No, absolutely not. I will prefer you to take a drop and prepare again because this is very little chance that you can improve your score in April mains.

There is no restriction as to how many students can appear for this entrance exam for selecting candidates for admission directly into the third semester of 8-semester engineering courses. You indeed have scored quite well in your Diploma exam and with this, I am sure you will be able to score quite well in DTU LEET exam also and make sure that you get the desired branch. To help you, I am attaching a link that will give you all the required information about eligibility and all other related aspects of this exam. https://www.shiksha.com/university/dtu-Delhi-technological-university-dce/dtu-leet-exam Best wishes to you.