we generaly now have 3 or 4 on the go at one time plus sciance write ups and they are seperat becuase it is for another qualification
i preffer to do mine 1 at a time and start with the 1 i know most about and get that out the way first then go down the lin untill i get to the one i know smeg all about

this worked untill i got my crittical thinking essay and now im kinda thinking i should do that first cos i realy know nothing about it and am going to have to reserch alot harder