Student resources hub (includes tips from current students) https://global.oup.com/ukhe/students/?cc=gb&lang=en&
Guidance on with writing tasks provided by Oxford Dictionary Online:
General advice on spelling and grammar: https://en.oxforddictionaries.com/grammar
Tests and quizzes: www.oxforddictionaries.com/words/puzzles-and-games
Advice on different writing styles: https://en.oxforddictionaries.com/grammar/writing-help
Examples of CVs and covering letters: https://en.oxforddictionaries.com/grammar/writing-help/job-applications