- Objectives
The same as here :
https://www.redhat.com/certification/rhce/objectives/
https://www.redhat.com/courses/rh300_rhce_rapid_track_course_and_rhce_exam/details/

- How to get the labs
git clone https://github.com/lofic/linuxlab.git

- How to update with the latest version
cd linuxlab
git pull

- Other interesting training resources :
http://trouble-maker.sourceforge.net/