Although the test is conducted on a computer, you do not need any additional computer skill for this test. However, if you make yourself familiar with the software interface, it may help you in the test. You can purchase this software along with the official practice book  from the Pearson's website or from any other credible source on the internet. 

The Official Guide to the Pearson Test of English Academic (2e))

Also, Pearson recommends the test takers to get familiar with the QWERTY keyboard. If you are not sure what it means, it's simply the type of keyboard most of us use on our smartphones or on laptop. However, these keyboards are bulky and you need to press harder than other keyboards.

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