UPCAT

There is very less chances to get in JSS but you can try in any other college or KIET. I am sure that you can get mechanical.

No, it's not necessary. Any state student can take the exam for admission.

Your rank should be under 2000 if you are from general
category or otherwise under 5K (OBC).

No, there are no chances of getting government colleges, but you can get the top private colleges under UPTU.

Sorry, but there are very low chances, but wait for the last round of counselling process.

Don't lose hope. Try for the last round of counselling process. I am damn sure that you can get good colleges according to your marks.

Yes, you can get the top colleges of UPTU. But try in every round of counselling process. I am sure that you can get any of these colleges:
AKG, Ghaziabad
ABES, Ghaziabad
IMS, Ghaziabad
RKGIT.

To get admission, you need to give CAT, MAT, XAT, CMAT or ATMA and then final selection will be done via a GDPI (group discussion and personal interview). These are the main and most important exams to crack not the UPSEE. However, a good score in the UPSEE will definitely help.

UPSEE Popular colleges accepting UPSEE scores are mentioned at the link provided below and can be used for your reference during choice filling. Regards. https://www.shiksha.com/b-tech/articles/upsee-popular-colleges-accepting-upsee-scores-blogId-10790.