Hello! How are you?
I see that you want to take the entrance exam to high school for the gifted (LHP, PTNK,...)? I'm in Sai Gon. I am a 3-year-experience tutor for the gifted and those wanting to take the high school entrance exam. Contact me if you need, my YH is mrtrungup.
Apart from PTNK, Le Hong Phong, Tran Dai Nghia and Nguyen Thuong Hien use the same test made by HCMC Education and Training Department. It’s OK for you to take a course at Ly Tu Trong, but intensive courses are useful only if you are good at essential grammar. They focus on practice tests rather than enhancing your grammar, vocabulary and techniques.
I hope those information will help you somewhat.
Nice day!