To ensure you are aware of any subject that might be on a test, the best strategy is to
a. ask someone who took the test earlier in the day
c. attend each class session
b. clean out your notebook
d. track your grades

c. Attend each class session.

Explanation:

Sometimes simple and straightforward advice is the best advice. In this case, though it may seem like common sense, it is important to be aware that if you manage to attend every class during the semester, then it most likely will mean that you will be familiarized with every possible topic covered in the test, and in this way you can study better for the final exam and probably do much better in your grades.

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average