'prerequisite before' is a grammatically correct and usable phrase in written English.
You can use it in a sentence to describe something that must be done before something else can happen. For example: "Passing a qualifying exam is a prerequisite before registering for the advanced course."
A further experimental study on real structures is an important prerequisite before the practical application.
The development of optimized vector systems seems to be a prerequisite before siRNA can be regarded as a suitable experimental tool for in vivo studies.
For evaluation of primary osteoporosis prevention, efficacy in the prevention of bone fracture is the prerequisite – before the use of bone mass as the main evaluation criterion.
German policy makers have said that kind of deeper budget integration and supervision is a prerequisite before any sort of euro bonds could be issued.
Some departments require students with D-level performance in certain prerequisite subjects within the departmental program to do additional work, or to retake the prerequisite, before proceeding with the follow-on subject.
NOTE - IMPORTANT PREREQUISITE: Before NS 4020 can be taken for a letter grade, the course must first be taken as S/U, the student may then request to take the course for a letter grade if they choose.
Look at prerequisites before freshman year and take them your first year.
Advanced placement into a next-in-sequence course depends on the completion of the appropriate mathematics prerequisites before enrolling.
Some of these courses have other courses as prerequisites; students are responsible for completing each course's prerequisites before they take it.
Prerequisites: before taking this course, it is encouraged that you read Aristotle's Nichomachean Ethics and Plato's Protagoras in English.
Mr. Abdullah reeled off four prerequisites before the shabab in any camp would agree to negotiations between Darfur rebels and the government: disarming the government militias; prosecuting those responsible for war crimes, starting with Mr. Bashir; expelling anyone who settled on land stolen from the displaced farmers; and carrying out all United Nations Security Council resolutions on Darfur.
