Been teaching tuition since secondary school mainly primary/secondary science and JC economics. I took 3 pure science in secondary school together with A maths and is well updated with the current syllabus.
I managed to help many student to improve their grades. One sec 4 student with F9 grade in Biology managed to score a B3 at O levels. Another student scored A for science in PSLE after receiving tuition for 2 years and has been scoring A even till now (she is currently a secondary 3 student).