Skill level increase for rooms... How does it work?

So I am wondering what dictates how fast the skill level for a room increases... I have noticed there is not a constant increase in skill percentage after I explore a room. I have tried using a helper to increase experiance, I got more experience points but I actually went up less percentage than the time before. Anyone know?? Maybe different modes gives u more (ex:night mode), or how fast you get through it or how many wrong clicks??

Hope not how accurate I am, bc a lot of times i go in a room I just click everything normally on the list that I see, then I look to see what I have left to find lol

Thanks!

What I have noticed consistently is you get a certain percent depending on what skill level you're at. I may have the wrong name for these or be out of order, but it is:

Beginner-5% each time
Novice-4% each
Professional-3% each
Advanced-2% each
Expert-1% each

I may be a little off like I said, but basically you get the same amount of increase every time you explore while at a certain level, then once you move on to the next level of mastery it decreases by 1%

WOW.. I thought it was MUCH more than that.. like 11 or 12% for beginning stages... so basically it is a fixed amount based on the level of that room... good to know.. sometimes I try to go SUPER fast thinking I will get more skill points for it! lol