addition of rules and value assigning in an ontology

Question

Say a degree recommendation ontology which is supposed to recommend a degree programme according to certain set of results you get for an exam.

E.g. a students chooses a stream he did the exam in and his results are: for chemistry, physics, and maths are C, C, C. Thereby he is supposed to be recommended a degree from a particular university.

The class hierarchy of the ontology is as

stream
  subject                                                                              
University
  Faculty
    Department
      Degree

Object properties have been defined as well.

1. Should the universities such as "University A" , "University B" have properties assigned in the class or to the individual?
2. How would I be able to assign different results to each subject?
3. How would I be able to add rules and conditions to the ontology?

E.g. engineering stream consists of only 3 subjects that can be done which are chemistry, physics and maths.
E.g. if you get a result of 'F' in one of those subjects a degree wont be recommended.