top of page



Sunny Hills High School 11th

Justin Kim

AMC 10/12 (AIME qualifier), SAT II Biology, USABO (Semi-finalist)

"I really loved and appreciated the teacher’s thorough, detailed, and clear explanations and lectures. He’s very knowledgeable and passionate in what he teaches and was very crucial to my success in both math and biology. Definitely recommend!"


Lexington High School 10th

Juhyeong Lee

USABO 101 (Certificate of Merit), USABO 201

"From the lessons of USABO 101, it was much easier for me to get a 5 in the AP exam and also get an A in the AP bio class. And although I did not make semifinals for USABO, I did get a Certificate of Merit from 2022 USABO Open Exam. In the class, the teacher goes over things in well detail and order, and personally, after studying and digesting my notes I took during the class, I could answer a lot of questions in my AP bio class in school. The class is a great way to learn AP bio and many different parts of the content of USABO."


Emery Elementary School 5th


"I am taking AMC 8 class. The classes were amazing, and I enjoyed them immensely. Because Mr. Kim made the subject extremely easy to understand. The way he teaches gives us the chance to work independently for a little bit, and he gives us hints and ways to solve the problem if we can't understand. I also like how convenient the way of posting and working on homework using Google Classroom, and how the live zoom classes seem like in-person classes. Also, the teacher explains why studying competition math is important for me, so I can develop motivation and passion for this class. Overall, I genuinely like this program and how it operates. I highly recommend this class!"

Crean Lutheran High School 12th

Elias Kim

SAT Math & SAT II Math (800-perfect score), Pre-Calculus, AP Calculus, Organic Chemistry, AP Chemistry

"I've had one of the best learning experiences that I couldn't have at anywhere else at STEM & ROOT Academy. If you are interested in focusing on STEM subjects and you want to learn them in-depth, this is your opportunity to do so at this place. The instructor clearly has a purpose for everyone to succeed, learn the materials, and love the subject. He genuinely cares about his students and he is very engaging and open to questions and feedback. Aside from Olympiads and AMCs, when I was in high school, I came across this academy in the summer to prepare for AP Chemistry and AP Calculus AB along with SAT II Math Subject Test. The learning materials were well-organized, with content presented in a logical manner. The instructor did an excellent job of extracting only the core, pivotal concepts I needed to know, which I really liked. After I've done much practice and have taken several simulation tests, I was able to receive a perfect score on both the SAT II Math Subject Test and SAT I math sections. I was also able to boost my GPA with my AP Chem. and AP Calc. AB grades with minimal stress during my first-semester senior year. This fall 2020, I will be attending Vanderbilt University as a music and biochemistry double-major, and I truly believe that STEM & ROOT Academy has given me the confidence and the knowledge that I need in order to bring myself up to this point. Overall, I highly recommend that you check out this academy. Trust me, you won't regret it once you get the hang of it."

Troy High School 10th

USABO (Semi-finalist), AMC 10, Biology Research Program

"Stem & Root has been extremely helpful in every class. I have learned biology in new perspectives that helps me understand better. The lessons are also customized to my experience and circumstances of which helps me focus on what I need to improve on. I highly recommend Stem & Root."


Sunny Hills High School 9th


"I’ve learned so much from the teacher who is very knowledgeable in the STEM field. He takes all questions seriously and answer them with great insight. I definitely recommend learning from him!



Brea Olinda High School 11th 

Grace Lee

AP Biology, AP Calculus, AP Chemistry, SAT Math

“Hello! My name is Grace Lee. I go to Brea Olinda High school and is currently in my junior year. I’m taking 4 AP classes this year and took tutor from John teacher on AP Bio and AP Calc AB. Before going to Stem & Root, I went to several other tutoring places but it didn’t help me as much as it did from Stem & Root. Usually it is really hard for tutor teachers to go in depth with the subject because there is not a lot of time but even with the little time, John teacher tries to tell you everything he knows about it and goes really like really in depth with the subject which surely helps especially for AP classes. He also gives you multiple choice questions and practice test for homework to help you out on AP testing. John teacher not even helped my grade but he also became my mentor and a counselor. He put on effort and time to my works and gave me the best he could. I know the price could burden some of you but I honestly think it is worth it. Hopefully this helped you to know more about stem root:) Thank you!”

Yeil Lee  

College Calculus

"One of the best place to get tutored for Calculus! The teacher is passionate about his teachings and he does a great job in clarifying and answering your questions! Totally Recommend!"



Brea Olinda High School 12th

Hyunseung Jeon

SAT Math, AP Calculus, AP Chemistry

"STEM & ROOT Academy 를 벌써 1년정도 수학이랑 과학수업을 받았는데 너무 너무 좋았습니다! 제가 영어가 부족해서 다른 학원을 다닐때 가끔 이해하는데 어려운 부분이 있었는데 한국말 영어 둘다 잘하셔서 저에게는 너무 좋은학원이었고, 또 과학 같은 경우에는 가르키는 학원이 별로 없어서 매번 혼자 공부했었는데 John 선생님께서 수학과 또 과학도 모든 수업을 다 잘 가르키셔서 성적도 많이 오르고 많은것을 배운것 같습니다. 제가 못 알아들었을 때면 몇번이고 다시 설명해주시고 또 까먹었을때에도 친절히 잘가르쳐 주셨습니다. 또 여러가지 과목을 잘 가르치시니 때론 시간이 남았을때 다른 과목 수업 질문도 하고 배울수있어서 시간 배분이 잘됐었습니다. 그리고 John 선생님 께서 너무 착하시고 또 수업외에 학생들에게 좋은 조언들을 많이 해주셔서 공부쪽만이 아닌 지식도 많이 쌓고 또 마음쪽으로도 많이 위로 받고, 의지했습니다! 수업도 하나 하나 천천히 잘 가르켜 주셨고 SAT 수업 받을때에도 단순히 test만 풀고 공부하는것이 아닌, algebra 1 부터 calculus 까지 하나 하나 다 배워 SAT문제 풀때에도 많은 도움이 되었습니다. John 쌤과 상담 쌤께 정말 너무 너무 감사드립니다!"



뉴잉글랜드 고등학교 Junior Mom 

USABO (Semi-finalist)

"우연히 스템 앤 루트를 알게 되어 수업을 받게 해보니 너무 좋은 학원이라 후기 남깁니다. 수업 문의를 드리자 먼저 제 아이에 대한 수준을 정확히 파악해 주셨습니다. 혼자 공부하다 보니 빠진곳도 많고 정확한 이해가 안 된 상황이였어요. 그 뒤 짧은 시간이였지만 아이에게 정말 필요한 수업을 해 주셨어요. 아이도 수업 받는 동안 원장님께 감사하다는 마음이 든다고 했는데 잘 이끌어 주셔서 동기 부여가 된 듯 합니다. 스템 앤 루트에서 수업 받은 시간은 정말 소중하고 유용한 시간이 되었습니다. 처음 모의 테스트를 봤을땐 크게 기대를 하지 못했던 실력이였는데, 원장님과의 수업 후 이번 바이오 올림피아드 오픈 시험을 통과해 너무 기쁜 마음과 감사한 마음으로 이 후기를 올립니다. 스템 앤 루트 아카데미는 저희 아이에게 정말 최선을 다해주셨어요. 감사합니다."

Troy High School Sophomore Mom


"Stem & Root는 여느 학원과 다릅니다. 좐 선생님은 대부분 학원서 주는 자료로 일률적으로 가르치는 다른 학원과 달리 스스로 커리큘럼을 연구하셔서 각자의 needs에 맞게 가르치시고 또 broad한 지식으로 원리를 쉽게 이해하게 가르쳐 주시기 때문에 여느 학원과는 차원이 다른 도움을 받으실 수 있습니다. 상담 실장님도 스케줄 등 항상 필요한 도움을 바로 바로 주시고 상담도 친절하게 잘 해주시기 때문에 학부모님들도 너무나 만족스럽게 학생을 보내실 수 있습니다. Stem & Root 학원을 강력 추천합니다."

bottom of page