The FB group you are looking for is called the CAL parents at UC Berkeley discussion group. It’s a closed group and takes a few days to be approved. It’s only for parents of students who have accepted admission, which is one of the questions
Be aware that MET typically means semester schedules of around 20 credits instead of the more usual 15-16 credits, in order to fit in all of the requirements for both an engineering major and a business major in 8 semesters.
In addition to the Cal Parents at UC Berkeley group on Facebook, I recommend checking out the the Cal Parents group website https://calparents.berkeley.edu. It’s the university’s group meant to keep parents informed and engaged – sign up for their newsletter to keep informed of some critical dates and events. Also, you can sign up with them to do a little volunteering (some opportunities exist for those who don’t live near Berkeley - people from this group host local admitted student events, for example). They offer some Facebook live events that can be informative especially for new Cal parents.