You'll go to a testing center to take the test, and it is all on a computer.
Different testing centers have different setups. I've been in some that are classroom sized with 15 computers and have been in ones with just 1 computer. If you don't like to hear other people...bring earplugs..
You will have to take both the 200-801 and 200-802 to be fully A+ Certified. You can purchase vouchers, or you can just pay directly to the testing center.
You can register to take your test here:
https://wsr.pearsonvue.com/testtaker/registration/Selec...
Just enter your zip code and itl'll find testing centers around you. You can either just pay Pearson VUE or you can purchase vouchers from somewhere else and enter the voucher when you register with Pearson VUE.
Hope that helps!