ALVIN Chi Yuk-lun, 17, one of four Queen's College pupils who scored 10 distinctions in the Hong Kong Certificate of Education Examination, attributed his success to his schoolteachers - and two ''private tutors'' at home. ''My mother is a chemistry teacher in a secondary school and she teaches me a lot about the subject. ''My father is a translator in the civil service and he is my private consultant on languages. ''I know I am lucky to have my parents as tutors. I had particular confidence in these two subjects. I learn much from them. ''They are so kind and supportive they have never given me pressure,'' he said. Alvin got distinctions in English language, Chinese language, mathematics, additional mathematics, physics, chemistry, biology, economics, computer studies and principles of accounts. He was surprised that he got an A grade in principles of accounts, which he learned on his own in less than a year. Alvin's classmates, Li Ka-yi, Charles Lee Tin-man and Wong Tin-pui shared the limelight, getting 10 As in the same subjects. Principal Kong Siu-chung said that when he joined the school seven years ago his best student gained only seven distinctions.