Here I think the task should be a little bit more clear.
For example in position 1 it is very easy for white to win, IF he already knows that black will take the knight at b1 ... But black is not forced to do that ...
Position 2 is an easy win for white after 1. Nc3+ or also 1. Nf6+.
In position 3 there is no bishop at f6. Your mistake is to have placed the white pawns at rank 7 instead of rank 2 (and reversed) ... see it? :)
Well your evaluations are much better than the problems (lol). Maybe a little more effort next time.