The format of answers. Is "False" or "false" OK?

[JohnSmith]

In the reading part, according to the description, the answer should be "FALSE" or "TRUE" or "NOT GIVEN".
But I find writing upper case letters is much slower than lower case ones.
Can I just write "False" or "false" with cursive handwriting?

I find the answers for some questions in the reading part is all in lower case, in my IELTS 9 book. These are not blanks to be filled and are absolute questions to be answered with no more than 3 words. I think the answer should begin with a capital letter. Is that right?

[Ryan]

Hi JohnSmith,

It doesn't matter whether you write uppercase or lowercase letters. Just be sure to write legibly.