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• Bronze S: 90% accuracy
  
  
• Silver S: 95% accuracy
  
  
• Gold S: 100% accuracy
  

Accuracy is determined by how many perfect hits you score, so for 100% accuracy you would have to hit every note perfectly. Getting full combo has little to do with what rating you will get. You could miss a note and lose the full combo but as long you hit at least 90% of the notes perfectly you will get an S.
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Use either Sailor Buro (Muse Plus) or Chirstmas Gift Rin(Free) if you have any trouble with the hard songs. Hope it helps!

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