Serco is one of the largest BPO service provider in India. if You are a undergraduate and you are looking to make your carrier in BPO sector so you can try here they provide average salary with all the benefits like PF, ESIC, HRA, TA etc.
serco also provide you the job security and you can grow your career. about the working environment it totally depends on which process you are working. after all it is a average but very strict company for there rules and policies.