Bricking it. Need advice.

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Got my exam coming up at the end of the week and I've been cramming through all of my material to try and get ready and realised that I'm drawing a blank on subnetting
I'm ok as far as the 255.255.255.0/25+ but it's really the maths then of working out of how many subnets this gives you and how many hosts within each that my head starts to spin a bit. Has anybody got a simple explanation or any tips or tricks???

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OK, I think I'm getting it after having a look with a clear head...

So for a Host address of 192.168.10.33 with a Subnet mask of 255.255.255.192;
Subnets= 2 to power of Network bits = 4
Hosts= 2 to power of host bits-2 = 62
Valid subnets= 256-192 = 64 / 0, 64, 128, 192
Valid broadcasts= subnet-1 / 63, 127, 191
Valid Hosts per subnet= 62

How did I do?

 

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I agree with all your answers. Good luck on the N+

 

Thank you! Just got out 10 mins ago, passed with 811

 

Very Nice. Congrats on the pass!