Over several years, students and families contacted me for IB Chemistry, AP Chemistry, A Level Chemistry, and IGCSE Chemistry lessons from Korea, Thailand, Taiwan, Singapore, Vietnam, Indonesia, Spain, the United Kingdom, the United States, Brazil, Myanmar, and elsewhere.
Some students struggled before improving; others achieved results that exceeded their expectations. Looking back through their messages reminded me that each lesson had become part of a much larger personal journey.
At the time, I was preparing another year of AP Chemistry and IB Chemistry teaching from Ho Chi Minh City, with occasional weekend lessons planned in Hanoi. The workload was tiring, but the messages from earlier students gave me energy to begin again.
Thank you to every student and family who shared a result, an acceptance, or a simple note of appreciation. Their privacy matters, so the English edition preserves the stories without reproducing the original identifying chat collages.