We've had MaRV since Agni-2 in the 90s.
There's two ways to maneuver the re-entry vehicle.
a) use of control fins (older method, used on Agni-2 and still used on most Pakistani BMs)
b) use of Divert & Attitude Control System (DACS) thrusters (newer method, used on Indian BMs from Agni-3...