Everything is covered in game, so I won't insult your intelligence by writing what you will be told anyway. Here I will list just a few pointers and things that helped me out.
In the regular levels, getting an S rank is not necessarily about speed. The most important thing to remember about S ranks is that you CANNOT LOSE A LIFE.
Also, I would not go for an S rank and getting Red Rings in the same run; some of them are in pretty obscure and/or dangerous locations, and it's just simpler to get them in a separate run.
Act 1 Tips: Don't rush too much, at least until you get a feel for the levels. For the most part, the higher paths are the safest, so try to get on top as much as possible.
Act 2 Tips: Save your boost gauge for open areas or 'on rails' sections to avoid boosting straight off the map. Take sections slow, as Modern Sonic tends to be a bit more 'floaty' to control than his classic counterpart.
Really, that's pretty much it. If I can help in anyway, then PM me here or to my PSN and I will do my best :)
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