Sercan,
No worries, that’s what we’re here for! Yes, you can and should take as many written exams as you can between now and your start date. You should also complete the rest of the getting started items: admissions flight, first class medial and apply for financing (if needed).
Once all that is done and you have a start date. Get started on the written exams. The King schools online ground school and test prep is great! They’ve been around a while and know what they’re doing. I used it! However, you could also download test prep apps like ASA and sportys and simply go through question by question.
Brady wrote up and amazing thread on every detail of taking knowledge exams. Review that and let us know if you have any additional questions.
Hannah