Good news for you as I have recently created the KLEXRaid map to track on EX raid eligible gyms and raids happening on the gyms.

This map will help you to locate nearest EX raid eligible gyms to you. Try to raid at these gyms often and you will have a higher chance to get the pass. Even if there is no raid, just hit the gym or feed berries to raise the gym badges. if you get silver or gold gym badges on the gym, you will have higher chance to get the EX raid pass.

I have been without fail getting exraid pass from a gym near my workplace almost every week as i have a silver badge on the gym. Tho the gym is on a spot where there are less people willing to travel there 
Hope this helps.

edit: oh wait, didnt see you are from Seremban  nearest EX raid gym i know of is probably around Cyberjaya. Most EX raid eligible gyms are in the parks.