how to go to botanic garden from HK central mtr n how to exit.can help me give a details direction.

U must refer to the Kadoorie Farm and Botanic Garden, right? Well, I suggest you walk from Central to HK station to take Tung Chung line to Nam Cheong, where transfer to West Rail line to get off at Kam Sheung Road. Near this MTR station, you can transfer to bus no. 64K to ur destination.