Anything will do. The key depends on the description of the company you are applying for. If you have the linked original registration form, of course, print it out. If there were no links at that time, there was not much difference between handwriting and printing. Handwriting is better, because it involves a question of being responsible for the information you fill in, and handwriting can't be seen by typing with a computer. Just bring your admission ticket and ID card with you during the exam, but the registration form, recommendation form and some of your documents are only needed for the interview after passing the written test.