The tests and exercises in COAsT online are used for preparation for the 11+ (Key Stage 2/ Year 6) for entrance to a grammar school and so most students will be in Years 5 & 6. Just a few of the Initial Assessments are for Year 4 and some Year 4 pupils may also use the Year 5 exercise too.
The subjects tested in the exercises online are: Maths, verbal reasoning, non-verbal reasoning and English. There are also some vocabulary exercises (e.g. Synonym Finders).
To access the GL types of verbal reasoning and non-verbal reasoning, you will need to tick the archived tests box when choosing the exercises.
Please see the parent information here: https://www.11plus.co.uk/for-parents/
If you need help assigning tests go to https://www.11plus.co.uk/coast-help-tests/
I hope that answers your question?