I would imagine you can seeing that the Scantron is graded by a machine (unless you request and pay for it to be hand scored)
I think it is quite risky just in case you were to make an error and then have no reference. For the 5 minutes during an entire test it may save you, you risk a lot more...
I mean, technically you don't even have to make a mark in the test booklet. But yeah, you can do that if you want but like Alex said, you might risk getting confused at some point.
Go for it. However, my suggestion would be to try it out on a timed PT and see if it really makes a difference for you. Don't go into test day and suddenly decide to try out something new.
Of course you can but the question I'd ask is if this would work in your favor or not. I would think this would make you prone to making a careless mistake, not to mention marking the answer in your test-book takes half a second. Give it a try with more than one PT but I still advise against it.
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I think it is quite risky just in case you were to make an error and then have no reference. For the 5 minutes during an entire test it may save you, you risk a lot more...