What statistical test to use and assigning samples?

Compare the effectiveness of three methods of teaching (IV). You plan to administer a standardized test (DV measured on an interval scale measuring knowledge acquisition) to the students in three classes with each class using a different teaching method.

What statistical test could I use and why?

What is the best method for assigning samples to the following hypothesis?

A class that uses one of three methods of teaching will have an increase in the level of knowledge acquisition.

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...the level of knowledge acquisition.
Here one way ANOVA is suitable to compare the means of knowledge acquisition under three methods of teaching.
A class is randomly selected and first teaching method is implemented there. Another class is selected from the remaining two classes and the second teaching method is adopted there. The third teaching method is implemented in the last class. The score of students before implementing the new ...