SAT Gamify plus vs. 14 day resource guide

I'm confused with the difference of Gamify plus and the 14 day guide, do I have to pay a monthly fee for the 14 day guide? Also I wasn't planning on buying the 14 day guide since I'm just taking it in December to get a feel for it and haven't studied a lot. Should I buy it now? Also will I still have access to it in the future (If it's a one-time payment)? Thank you!

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