[fandom] Glee questions

Does anyone know of a good Glee timeline? The episodes seem kind of sporadically timed and also watching them out of order and only the ones vetted for me probably isn't helping. Obviously "Silly Love Songs" takes place around Valentine's Day and sectionals was in November, but is there a timeline I can reference?

Are they all juniors?

Anyone have a good resource for what vehicles they drive?

( spoilerly for Blame It On the Alcohol and vaguely spoilerly for earlier episodes )