A final poll before the election, released by opinion research firm Merdeka Center, forecasts that Najib's BN will prevail in the election, but with the popular vote collecting from Peninsular Malaysia dropping to 37.3 percent from last week's 40.3 percent.

The survey shows that BN will win 100 out of the 222 parliament seats, while the opposition alliance Pakatan Harapan, or Alliance of Hope winning 83 seats. The rest of the seats are too close to call, according to the poll.

The 15 million eligible voters are expected to cast their votes between 8 a.m. and 5 p.m. on Wednesday. The election commission said the final results could be unveiled in late night. A simple majority of 112 parliament seats will produce a winner.