Based just on what you have summarized here, you do not have a sound discrimination claim against the school -- or any other kind of lawsuit. Admission to the school is competitive; you took a test as part of the competitive admission process; you did not do well enough to be admitted. You claim that you studied the wrong material, but that is not a provable claim and, even if it were, the school was not legally obligated to furnish you with reliable info as to what to study.
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You facts sound more in misrepresentation or some other contractual area than discrimination. The relevant facts, in my opinion, are unclear or missing. As stated they have not outlined a cause of action but would warrant additional investigation. Call my offices, or another attorney, to discuss you situation.
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I have to agree completely with the others who have responded. Your facts do not lay out a cause of action against the school. You have provided no facts which correspond to any type of discrimination or for that matter any other grounds for legal action. The school required an admissions test of students wishing to attend the school. All students had to take and pass the test. The school had no obligation to test you how to prepare for the test. It may be that someone's effort to help you, actually misled you as to what to study for, but this is not actionable.
Unless there are facts or details not shared above, there is no legal action that can be taken.