If you have an IXL account and hit a 10-question limit, double-check to make sure that you are signed in! Look for your name or profile icon in the upper-right corner. If you don’t see it, click Sign in and enter your username and password.
If you are signed in, then look above the question you were working on. You should see a banner that says you are “previewing” this subject, which means your account does not include access to this subject. If you have IXL through your teacher or school, talk to your teacher to learn more about what subjects you have access to. If you are on a family account, you can upgrade to include the subject and practise as many skills as you want!