Welcome Jimmy,
Exams intimidate all but the most experienced exam takers. Exams are not the best way to determine competence, they are just the most practical, and can be given by people who, themselves, may not be competent to judge your competence.
Take the exams when you are ready, they are your opportunity to express what you know, rather than to intimidate you, and remind you of what you don't know... Think of exams as working for you, rather than the other way around!