on average 4 right answers out of 6 questions will be enough for clearing level 2 ?

discussed several times here, some heated arguments about it too! short answer - nobody knows. I’d say aim for at least 4 on all the vignettes, and maybe a couple of 5’s and you’ll be fine. 10 vignettes per session. Get 8 x 4 + 2 x 5 and you have 70% which seems to be the accepted passing mark.

aim for all 6, and you should be in good shape. next topic please!