Hello student I'm sorry to inform you but no before graduation you're not eligible for UPPCS as eligibility criteria says Candidate must hold a Bachelor degree in any discipline. For certain courses you need to hold specialised courses.

Age limit - 21year - 40 year old.

For more updates refer to the link mentioned below - https://www.google.com/amp/s/competition.careers360.com/articles/up-pcs-eligibility-criteria/amp

Feel free to comment if you have any doubt

Good luck