NMK

The only thing that really works here is your subline 'construction, AB' the rest just shows you are an amateur who lacks basic knowledge of graphics & logo design.
I mean, c'mon... you chose the wrong type of sans serif to even start playing with negative space acronym and your execution sucks badly.
Back to studying, this is not going to work by a long shot.

Because the space between the boxes and the width of the text are the same, your eye gets really confused. Definitely change that font and be aware of that when choosing.

Other than that, it's simple, which is good. But, there isn't much of an idea going on.

Doing it right it would look like KLM w/o the crown.

"NMK" has a lot of potential because all letters can be made with straight lines. Take advantage of that.

Too many lines, try to remove unnecessary elements.