Get Minecraft for Education:

Chromebooks - Log into you personal account and download Minecraft for Education for the Store. More Info here

Yes: You can use other versions of Minecraft for our lockdown challenges e.g. XBOX , iPad or PC Java edition etc...

Sign into Minecraft for Education using your school email address and password (the one we gave you).

How to do a screenshot or video on a Windows or Chromebook device.

Chromebook - Screen Capture (Video or Picture)

Use Windows 10 XBox Game Bar to record

Otherwise try the Windows Snipping tool to take a picture.