Any recommendations for academies to prepare for university?

I apologize beforehand for any english/grammar errors.

In Korea, there are many mainstream prep schools and academies that help guide students preparing to study abroad (i.e. USA, Canada, Etc.). However, these institutions produce mixed results and some are perceived to be "overrated". 

Currently, I am searching for an academy that can help me and my family.

Although I have done some research, I do not know the perception of the locals, expats, and academics in Jakarta.

Any recommendations would be appreciated.

Edit:
Thank you for your DMs Everyone
Shoutouts to Dense-Holiday9296 for the find and referral code.
<https://www.eventbrite.com/e/ycg-global-talent-incubation-in