Here are some very good articles about improving your driving skill and pace. Although they are meant for karting, it applies to all kind of racing, including simracing:
http://www.evenflow.co.uk/articles.htmPersonally I disagree with some things, particularly in the psychology article, or rather, they seem to omit some basics that you need to tackle before doing what's described, but nonetheless those are a very good read and might help out those of you who have struggled but were unable to improve for a long time.