雅思听力考试单词大小写区分
ESOL answer:

"Dear Sir or Madam

You may use either upper or lower case on your answer sheet. You will
not be penalised for how you write an answer provided it is spelt
correctly.

You are not, in fact, required to use upper case for proper nouns,
although it is obviously good practice to get into this habit.

I hope that this answers your question sufficiently.

IELTS Exams Administrator
Cambridge ESOL"