just read from lianxin's blog and know that mrs heng had retired. apparently, mrs heng is my sec4 chemistry teacher and also one of the teachers-in-charge teachers. ever since she started teaching me chemistry in sec 4, i had been getting E8, F9 for chemistry except for 1 common test :x during O level period, didn't really used her notes as found it a little useless so used guidebook._. but thank god, i passed my O level combined science. so at least didn't let her down:/