To avoid jam,
A1.From ioi u take the road that goes to technology park (mimos) via kinrara. Go until u can enter PLUS hiway.
A2.From there, go to KL then turn to istana negara then straight u just follow the jalan duta signboard.

alternative

B1.From ioi, u take the USJ toll (rm1.60 toll-the one heading to klang) after that u make u-turn at the junction near summit to enter KESAS.

From KESAS u go straight until u passed Carefour Sri Petaling and there's an exit for KL. Then u just follow route A2 above.