按照那个官方文件(E37019)的说法:香港大使馆需要:
Post-secondary education documents: vocational or technical certificates or diplomas;
• College or university documents: certification of completion and the graduation degree,
diploma, or certificate issued by the college or university and the evaluation committee;
• Transcripts: original transcripts of all degrees must be submitted in university-sealed envelopes.
似乎是说高中以后的学习要认证学历学位。而成绩单要用学校密封的信封提交,与认证中心没关系阿。