It is every student's dream and the inspiration for many a movie scripts: altering a failing test grade into a passing one. This is not particularly difficult. While this example speaks to the imagination, challenges in the field of education are much greater than this, and additionally depend on the type of school involved.
Further and university education in particular consist of large and complex organisations with equally large and often relatively open networks. In addition to this, consider that more and more educational establishments conduct exams and tests electronically and it will be clear that protecting privacy-sensitive student data must rank highly on a list of priorities.