Inner join med 3 bord i mysql

Nästan korrekt.. Titta på sammanfogningarna, du hänvisar till fel fält

SELECT student.firstname,
       student.lastname,
       exam.name,
       exam.date,
       grade.grade
  FROM grade
 INNER JOIN student ON student.studentId = grade.fk_studentId
 INNER JOIN exam ON exam.examId = grade.fk_examId
 ORDER BY exam.date