I think you need to get a clear picture from the staff regarding exactly where he has difficulties and how they intend to support him. In my experience, these kinds of problems do not readily resolve themselves and it is likely he will need some additional support. For example, he probably finds it hard to remember what people have told him will be happening during the day. This can really exacerbate anxiety. Simple measures, like giving him a detailed timetable of the day's routine, can help him to anticipate the sequence of events. You can use this at home and school. You can use written words or pictures depending on his lieracy skills. For example, the timetable could show that after school on Monday he will go swimming then to his Nan's for tea. You and his teacher should go through the timetable at the start of the day so he knows what will happen and at the end of the day, to talk about what has happened.
Within class he is likely to need individual instructions when tasks are being explained to him. These should be given individually to allow him time to understand each one. They should also be given written down so that he can refer to them if he does forget. It will help if the task can be demonstrated to him while it is being explained as the demo will help him to understand and remember the words being used and the sequence of events.
The simplest way to think about supporting him is how you will provide an external system to compensate for his poor memory.
In terms of his literacy difficulties, that will need more detailed investigation in order to determine how best he learns. He might be someone who finds it easier to remember words by sight than by sounding out. If he also finds it hard to learn the look of words, at this stage it is important to ensure that his literacy difficulties do not hinder his access to the curriculum and he will probably need help to read classromm text and to record his answers. It may not be that helpful to have someone scribe for him if he cannot read what they have written. Hence the need for further assessment to see what will be best for him.
If the meeting does not make you feel confident that the staff know how to support a child with memory difficulties, you might want to recommend a book to them. It's called 'Memory and Learning: A practical guide for teachers' by Bristow, Cowley and Daines. It's published by David Fulton. There's also a very useful website called 'All Kinds of Minds' by Mel Levine. It has an excellent section on managing different learning difficulties.
Let us know how you get on.