Are you allowed to calculate on paper? e.g. corresponding squares? (FIDE/Club level etc) I have been looking at corresponding squares recently. 

It can be pretty hard to visually calculate and imagine them in your mind. 

What I was wondering, would you ever be allowed to draw your plans on paper? 
I know in tournaments you are allowed pen &amp; paper for your moves, could you scribble on that or under what circumstances would this not be allowed? I would have assumed in world championships you would not be allowed to do this. Is my assumption correct and what about club level / school players etc?

Example of what I mean by calculation: http://www.chess.com/forum/view/chess-mentor/tricky-chess-problem-elo1700---corresponding-squares?ncc=3
This is never allowed in an actual, over-the-board tournament.

National chess federations ban analysis notes, and local chess organization follow their national rules for rating.