Microsoft 365 Certified: Fundamentals MS-900 certification

Great that you want to take a certification sa2my96 
I haven't taken any of the fundamentals tests, but I have a lot of other Microsoft certification test.

I belive that one has 40-60 questions in 85 minutes.
Passing score in Microsoft tests are 700 out of 1000 possible points.
But that is not necessarily the same as 70% as the questions have different (secret) weightings.

If you are a student or work in IT sales, the fundamentals are probably a good thing.
But if you work as a tech I would skip that level. At Microsoft Ignite 2019 they had a big testing center for all the other certifications and just a couple of PCs outside in the reception of the testing area for the fundamental tests. So for a tech I would say the only reason to take them are just to learn how the certification tests work or if you are just starting out in the business as a junior or still a student.

JT
M365:Enterprise Admin, M365:Modern Desktop Admin Associate, Azure Admin Associate, 3xMCSE, 4xMCSA