Yes!
Our qualifications are focussed on assessing skills and knowledge and we do not assess spelling, punctuation or grammar. Whilst the courses do require written responses, it is still the knowledge and grammar that is being assessed, so as long as our assessors can understand what it is your learner is trying to communicate, they will be able to hit the assessment objectives.
If your learner is a reluctant writer you may find that the course format appeals to them as the workbooks are designed to be typed onto rather than hand written. It is also acceptable for adult facilitators/parents, to scribe for their learners - providing that they do so in the learners own words.