DD and DS1 get the train 3 stops to Southend East and there are dozens of other SHSG pupils who come from much further up the line (Coach C is the place to be for year 8s, I think
). If you have easy access to Barking station this would be the easiest way to school - to get to school 'just on time' you would be looking at the trains which arrive at Southend East at 0754 - time for popping into a shop / getting a quick drink in the canteen / visit to the library - or 0809. Come out of the station on the side on which you arrive and follow the herd. Don't forget to get your Scholars Season Ticket (info on school website)
(Yes, I am a bit of a public transport evangelist
- much more flexible than a coach and the trains normally carry on running in the snow, which coach / minibus drivers may decide not to do).