How do I make my own high score 'Room'

Here's some help on the matter:

highscore_value(place)

Returns the score of the person on the given place (1-10). This can be used to draw your own highscore list.

highscore_name(place)

Returns the name of the person on the given place (1-10).

draw_highscore(x1,y1,x2,y2)

Draws the highscore table in the room in the indicated box, using the current font. The first two can be called in any event, the last is for the drawing event. The easiest way is to use that last command in your "highscore room", like:

draw_highscore(room_width/2-200, room_height/2-200, room_width/2+200, room_height/2+200)

Which simply draws the highscore table as it appears in the highscore form.