Year 10 is one of the most important years in your life. Work hard this year in coursework modules, and you will have chilled out year 11 even though you will have exams. Coursework counts a lot towards your final grade depending on the subject.
Don't slack off thinking " oh it's okay, all the proper exams are next year" do everything you can and revise well before exam time, it will really help you for year 11 !