does centre matter??plese reply !!thanks.

hi..i wrote my pcc exams this november, but got unexpectedly low marks in a few subjects, though my exams went quite well. I just had this query that whether the exam centre has any impact on the result?I gave my exam from a small city in south..and eventhough it might sound stupid, yet i hope there mustnt be any regional biases in results i suppose?cos among all others who mostly belonged to south, i was the only  there punjabi i think...thanks..pls rply!!