See the full text: Member States are obliged to admit to their territory third-country nationals who wish to stay for more than three months for study purposes, where they meet the conditions for admission exhaustively
See the full text: Member States are obliged to admit to their territory third-country nationals who wish to stay for more than three months for study purposes, where they meet the conditions for admission exhaustively listed by EU law – They are therefore prohibited from introducing additional conditions for admission (Press release, pdf)
And: Advocate-General Opinion: Full-text (pdf)