Hi and Welcome to the forum, you might want to have a look at the following FAQ which explain where everything is
Welcome to Benefits and Work In case you are not aware, your real name appears to be showing in the forum, if you want to change this then follow the instructions in the following FAQ
My full name is showing, how can I stop it?
Eligibility will depend on how many hours care your son is providing and how many hours he is studying. It is explained in this link
www.gov.uk/carers-allowance/eligibility If you have further questions please reply to this message and we will do our best to help. You fill find it easily in future if you bookmark/favourite it on your web browser now