Well, you can do it now, with the Red Hat RSHCSA/RHCE Certification Preparation Study Guide from Tecmint.
This ebook, along with the official Red Hat Enterprise Linux 7 official guides, will help you prepare to take and pass the RHCSA (EX200) and RHCE (EX300) exams. As you know, both exams are aimed at determining if your knowledge, skills, and ability to meet those required of a junior and senior administrator, respectively, of RHEL 7 systems across a wide variety of environments and scenarios.
You can buy the ebook for $35 USD, for a limited time, plenty cheap enough. I may do this myself!