Actually there is a shortcut 
It's called 'Woodcutter's Trail'. Enter at your own risk!
1)From Zhenghua Park, you'll find a trail under the BKE. N1 22.609
E103 46.579
2)Follow the trail and make your way to the start of Woodcutter's
Trail. 1°22'41.88"N 103°46'50.49"E
3)Follow the trail all the way East.
4)Arrive at Upper Peirce Road. N1 22.815 E103 48.644
5)Make your way out to Upper Thomson Road, and you have reached the
western part of AMK.
Warning: Do not go alone.
