http://www.ssdcl.com.sg/
They've moved from Ang Mo Kio (or was it known as Yio Chu Kang) but the current website says that the SSDC Ang Mo Kio Branch Office still open for certain operations like 'Enrolement Of Courses' & 'Booking & Cancellation of Lessons'. However, it's better to check at the website if it's still open. Below it the Address & Operational Hours of the their new Office at Woodlands.
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Address and Operational Hours
http://www.ssdcl.com.sg/address.asp
Address:
Singapore Safety Driving Centre
Woodlands Circuit (Main Office)
2, Woodlands Industrial Park E4
Singapore 757387
Tel: 64826060
Counter Operating Hours:
Monday to Friday : 7.45am - 8.25pm
Saturday & Sunday : 8.00am - 3.45pm
Closed on Public Holidays
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