Which preposition should I use when I want to covey the meaning of 'until' (defining the end of an extent or an action from a certain point) but not referring to time but an actual stuff? It's so confusing since in my native langue, we just use the same preposition no matter it's time, page, or place if it has the meaning of 'until'.

which preposition should I use in the place where I used 'until'?

ex> I read until pg. 50. I solved until number 6. You need to fill out (the form) until the 5th box

Which preposition should I use when I want to covey the meaning of 'until' (defining the end of an extent or an action from a certain point) but not referring to time but an actual stuff?

It's so confusing since in my native language we just use the same preposition no matter if it's time, page, or place.

Which preposition should I use in the place where I used 'until'?

For example:

I read until page 50.

I solved until question number 6.

You need to fill out (the form) until the 5th box.