Have to pass time/revise at a peaceful place before exam near transport Nagar metro station

I have an exam in Lucknow, will reach around 8 am. Exam starts 1:30 pm at a centre located near transport Nagar metro station, just need a place/cafe/park where i could pass time/revise which would be open so early. Also, suggest any breakfast place tooo so I don't have to give the exam hungry.