The majority of children are not diagnosed with dyslexia until they are in primary school or even later.The earlier dyslexia is diagnosed the lesser the impact.
Here are some signs of dyslexia to look out for in primary school children:
• Mixing up letters while writing, such as "m" and "w", or "d" and "b".
• Issues with reading
• Complaining of feeling dizzy. feeling sick or getting headaches when reading
• Avoiding reading aloud in class
• Doesn't enjoy reading
• Issues with their handwriting
• Finds it difficult to retell stories in the right order 
• Reads at a lower reading level
• Writes some words backwards, such as "was" instead of "saw" 
•Problems learning some aspects of grammar