Keystone Education (formerly ACI Diamond Bar)

Kyle Lin _{on Google}

Jan 11th, 2022

Keystone is amazing. I have practically been raised by Keystone, formerly known as ACI, as I have been enrolled for my whole life! Not only did Keystone help me immensely for preparing for my SAT through their SAT course, but their college counseling have actually helped me get into New York University. Keystone not only produces results, but they really care about their students as well. Every teacher is open to talk to their students and provide emotional support. Overall, I just want to say thank you to Keystone for being such a large part of my life!

John Au-Yeung _{on Google}

Dec 26th, 2020

I am the parent of two children who has been attending Keystone for close to two years- both physically at Keystone and on-line teaching. I am absolutely very happy with the school and with my children's academic progress. The teaching staff is very professional and is truly helpful to the children. The admin staff bends over backwards to be accommodating and helpful as well. The school provides an excellent safe and quiet platform for the children to learn. We truly appreciate Keystone's guidance in helping our children grow academically.

hi there _{on Google}

Oct 31st, 2020

There is a little too much homework but it helps us keep learning.

Mikki Chen _{on Google}

Jul 25th, 2020

The staff really cares about how my boys are doing, both in public school and in their classes at Keystone. I like the way they encourage them to try harder. I have seen a big improvement in both their schoolwork and their attitude. Now they almost never complain about doing extra work. Thanks for your help!!