Until one or two years there was almost no online trainings for the RHCSA & RHCE 7 certifications.
You had to take Red Hat classes or study by yourself through books.
Now, companies like EdX, Udemy and LinuxAcademy to name some of the most known have started to create good contents.
You can now find most of them in the dedicated RHEL 7 online training page.
Linux Academy is free for 60 days with voucher from Microsoft (Visual Studio Dev Essentials).