"necessary courses" is correct and can be used in written English.
It refers to courses that are required or essential for a specific purpose or goal. Example: In order to graduate, students must complete all of the necessary courses for their chosen major.
Calvert-Smith insisthatthat panels did not veto release purely because prisoners had not completed the necessary courses.
The Pre-Combined Plan Curriculum Guide outhenecessaryecourses courses for guaranteed admission.
"The growing number of students earning Regents diplomas indicates that schools are putting in place necessary courses and support to help students reach the higher standards.
It is focused on the necessary courses and skill sets needed for successful entry into the accounting industry.
Many other teachers, however, are hired and placed in classrooms with just a college education and then struggle for years to pass their certification exams and take the necessary courses toward a master's degree.
Jackson ultimately completed the necessary courses, and in 1958 she became the first black female engineer at NASA, which had been established earlier that year; NACA had been incorporated into it.
Such steps are not bellicose; they are simply the necessary course to contain an imperial regime.
Some occasions do exist when doing more better is the right, the necessary, course to follow.
"We will investigate these circumstances further and determine the necessary course of action," Intrade said in a brief statement.
We often think of military intervention as an unfortunate if sometimes necessary course of action compromising truly humanitarian values.
The "officer" introduces himself with utter confidence, sure of himself and unambiguous about the necessary course of action.
