What is n level?

The "General Certificate of Education 'Normal' Level Examination", otherwise known as the "GCE 'N' Level" or the "'N' Levels", are examinations conducted annually in Singapore taken by students after four years (Secondary Four) in the Normal Academic or Normal Technical streams, with a possibility of leading to the "Singapore-Cambridge General Certificate of Education 'Ordinary' Level Examination" in their fifth-year.
The University of Cambridge Local Examinations Syndicate (UCLES) is the examining authority for subjects conducted in the English language, foreign languages and Non-Tamil Indian Languages. The examining authority for other subjects such as the mother tongue languages is the Ministry of Education, Singapore.