EYFS and Childminding

As a Registered Childminder following the EYFS for all my pre-school children currently, I understood that when these children start reception class, that I would not need to continue will all the extensive observations, and assessments that I am doing at the moment for them. As they will effectively become before and after school children and only be with me for aprox 3 hours per day I feel this not necessary. A child does not count in our under 5′s ratio once they start reception so does anyone know the answer to my question that should we be continuing with the paperwork until the 31st Aug following their 5 birthday irrespective of whether they are in reception class or not.