Read through it all carefully. Pick your favorite things (4-5) that you are not already doing, and then do them each time you practice sight reading.
We usually sightread previous year’s SR pieces on T/TH starting about a month out. In your planning, know that the 1st 2-3 times (more for NV bands) will probably take the whole period. Be sure to practice EVERYTHING. How to sit, where to look, how to finger, etc.