MSc PEP Application Questions

I am applying for the MSc in Politics, Economics and Philosophy and had questions concerning the higher education entrance eligibility, information on my first degree, and grading scale sections.

(1) The section on Information on higher education entrance eligibility asks for a "Grade in the higher education entrance eligibility." I graduated from high school in the US, with a 4,6 GPA (weighted), I attached to this message for reference.

: high_school_grading_scale.png (42.59 KiB) 269 mal betrachtet

I was wondering what grade I should enter in that field (what number).
Additionally, I do not see a field to submit my high school transcript/diploma. Is that correct?

(2) The "Information on your first degree" section asks about the "Regular term of study," in semesters. At my university (the University of Oregon, in the US), there is no fixed length of study, only how long it takes the student to take all the courses they need to graduate. Additionally, we have quarters (Fall, Winter, Spring; we are not required to take courses in the Summer, the other 3 constitute the main part of the academic year), not semesters. In most cases, it takes people 4 years to graduate, but not always (I am graduating in 3). What number of semesters would it be your advice to put in response to this question?

Thank you in advance!