how to do well on the math subject GRE

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so since i got rejected from all the grad schools i applied to last cycle I figured I should start studying for the math subject GRE again (last year it was cancelled due to covid). For any anons who have done well (ie >80%) how did you do it? I've heard that some people (especially foreign students) study for years and years, but I only have until september and october. So how can I realistically study to maximize my score? Last year I would spend 7-8 hours every day studying but I still did not feel prepared at all. So I'd like some tips.