If i don't get 50 marks in English exam in 12th class than i can apply for upsc
greetings,
UPSC, being a graduate level exam, does not care much about your 12th percentage as long as you have passed. The eligibility criteria for UPSC is universal and lenient to ensure participation of all Indian citizens 21 years and above to contribute to the functioning of our nation. In that regard, scoring less marks in school or college is not considered a demerit.
good luck for your prep.