Class diagram for a registration in a university help!

i need a class diagram for my following scenario i neeed help fast pleaaseeeeeee

Problem scenario
As the head of information systems for a college you are tasked with developing a new student
registration system. The college would like a new client-server system to replace its much older
system developed around mainframe technology. The new system will allow students to register for
courses and view report cards from personal computers attached to the campus network (Local Area
Network (LAN)) or using the Internet from outside the campus. Professors will be able to access the
system to sign up to teach courses as well as record grades.
We notice that the college will keep the existing course catalog database where all course
information is maintained. This database is an Oracle relational database which can be accessible
from the college’s server which runs a MS-Windows operating system.
At the beginning of each semester, students may request a course catalogue containing a list of
course offerings for the semester. Information about each course, such as professor, department,
and prerequisites, will be included to help students make informed decisions.
The new system will allow students to select four course offerings for the coming semester. In
addition, each student will indicate two alternative choices in case the student cannot be assigned to
a primary selection. Course offerings will have a maximum of ten students and a minimum of three
students. A course offering with fewer than three students will be canceled. For each semester, there
is a period of time that students can change their schedule. Students must be able to access the
system during this time to add or drop courses. Once the registration process is completed for a
student, the registration system sends information to the billing system so the student can be billed
for the semester. If a course fills up during the actual registration process, the student must be
notified of the change before submitting the schedule for processing.
At the end of the semester, the student will be able to access the system to view an electronic report
card. Since student grades are sensitive information, the system must employ extra security
measures to prevent unauthorized access.
Professors must be able to access the on-line system to indicate which courses they will be teaching.
They will also need to see which students signed up for their course offerings. In addition, the
professors will be able to record the grades for the students in each class.