Over 10 years ago I used this blog to document my work for the TAQA Assessor/ L3 Certificate in Assessing Vocational Achievement:
UNIT 1: Understanding the principles and practices of assessment (3 credits)
UNIT 2: Assess occupational competence in the work environment (6 credits)
UNIT 3: Assess vocational skills, knowledge and understanding (6 credits)
It seems it has helped quite a few people
If you need any more help with this all I will ask for is a coffee for my time and I'll email/ video call to assist
Thank you