Dong has tutored my son on GCSE maths for last one year. My son has made tremendous progress with his help. Dong is a very gifted tutor who was able to explain complicated and abstract rules in an impressive way ( with lots of interesting examples and useful tips of how to remember it ) that my son can understand and remember them in a couple of times. Also he taught my son how to make as few mistakes as possible when taking exam.
As a result, my son has achieved good marks on several mocks.