The global pandemic complicated both learning chemistry and, importantly, preparation for examinations. One of the problems which students face is the lack of teachers' attention, whereas the implementation of such distance learning technology as a chatbot represents one possible solution. The Chemist Bot was created specifically to help Russian students prepare for the final chemistry examination. It provides various activities, including the access to theory, the opportunity to complete the real exam tasks, and educational games. Over a period of three months, 465 students took part in the Chemist Bot activities, and 52 of them shared their real examination results. It was revealed that both the completion of exam tasks and participation in extracurricular activities are helpful for training and preparation. In the present experiment, it has been shown that 13 of the 15 students who wrote the full United State Exam (USE) sample in the bot and scored at least 53 out of 66 points in the Chemist Bot then scored over 80 points on the real USE (which is 80% of the maximum USE score and is considered excellent by FIPM -- Federal Institute of Pedagogical Measurements, Russian Federation). Currently, the Chemist Bot is involved in preparation of new participants: those students who are going to pass the exam in the summer of 2022.