Log in into the ETS website here
https://ereg.ets.org/ereg/public/jump?_p=GRICreate an account or sign in.
Once logged in in your home page you will see the following
Attachment:
GRe ets .png [ 15.21 KiB | Viewed 46 times ]
click on it AND YOU WILL BE INTO THE STORE NOW.
At this point go down at the bottom of the page and you will see others resources
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GRe powerprep.png [ 710.32 KiB | Viewed 46 times ]
add to cart the powerprep you wanna - timed or untimed - and go to the checkout. Of course. you will buy them but you will NOT pay anything to them. They are FREE
I hope this helps