Cisco or check point exams?

Im doing a CCNA, its looks OK but i need to get my head around subnetting EG:



stuff like that, although thats an easy one. Is there an easy way to remeber stuff like that, like a table with them all on which would be easy to recreate at an exam. how do you guys do it? (dont say use a calculator)
And remembering subnetting with VLSM's.
 
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