To OP:
You should always write out your responses rather than type because you need to replicate exam conditions as closely as possible, you will not get marks if your handwriting is illegible, and a valuable portal by which you can ensure your handwriting is legible is through regularly practising writing with pen and paper whenever possible. Furthermore, as typing is faster than writing for most people, it will not give you an accurate indication(if you choose to type) of your exam time management skills in exam, e.g. you may be able to finish within the exam time limit with typing, but may not do so with writing, and not getting this kind of information before the exam might have a significant impact on your actual exam results and performance.
btw how many pages do you guys normally write in an english exam in 45 minutes? I write quite slow and normally finish exactly on time. T_T
It is hard to determine, because everyone has different sized handwriting and choose to space things differently, you should finish exactly on time-since that shows you are using the exam time in an efficient way, for me I usually wrote around 5 pages for my essays (but then, my handwriting was barely legible during exams). Remember, it is quality over quantity