Yes, this can be done at any time before the completion of your first calendar year by providing evidence of an IELTS 7.0/TOEFL 90 score or greater (or its equivalent on any KAUST accepted admissions English language test). You must provide a valid test certificate of one of these accepted English language tests to Admissions and the Office of the Registrar.
No, this has to be done by yourself through an external, official testing center or online provider.