Just a little input from someone who was in the same position;
I had lost faith in my old techniques, so I gave it a try, and was happy I did so!
I had three weeks.
But it was because Photoreading made total sense to me and I knew I could do it if I was particular about following the instructions!
And I gave myself permission to combine it with my old ways that worked whenever I felt the need to do so. Not often, but it was important to me to know this, so I did not feel stressed.
My advice? Ask yourself if you are willing to take the chance!
If you panic; go back to study in your old way for the test.
And instead;
just have fun with PR for a session or so ( on studymaterial ), sometime during the day,every day, when you feel up to being playful. And follow the good advices that have been given by the earlier posts here.
This might turn out to be very helpful on your test, but look at it as ekstra bonus.
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As I said; I did it because I felt I had nothing to lose 
Good Luck on your test!!
Laughing-heart
