Use lower case and a hyphen whether used adjectivally (a 100-level course) or nominally (doing a paper at 100-level). However, use a capital 'L' and a numeral for NCEA levels.
- The students found the 300-level course much more challenging than expected.
- Papers at 100-level tend to be held in the largest lecture theatres in order to accommodate all the students.
- NCEA Level 3 is said to be a demanding qualification.
- Dr Joseph Bloggs needed to have a guest speaker present to his 200 level course on Friday.