Any tips/methods for subnetting quickly?

Hi guys,

I’m about 2 months into my CCNA studies now - it’s going very well and I am happy with the progress I’ve made so far. One of my concerns is subnetting quickly/efficiently for the exam.

I don’t have a testing centre near me so I will be doing the exam remotely when the time comes. I cannot for the life of me imagine using the Cisco notepad with my mouse to do all my workings out. I struggle as it is with a pen and paper.

Do any of you have any methods or tips that I can use to be more efficient? I appreciate there’s many different questions you can be asked so I guess I’m just after some general tips for any kind of question on subnetting. Also, for those of you that have taken the CCNA, how many of your exam questions were on subnetting? 1, 2, 3+?