how to prepare For Gmat & Which institute to Join

hi All, i am a working proffessional with 9 to 6 job 5 days a week. i have 5 .5 years of IT Experience and is looking to do MBA to add to my profile. i have been discussing with my friends who are appearing for GMAT or have appeared in last 6 months about which institute to join? i am from CHandigar...