Each exam has also ISTQB® release English sample exam, which you can find here. FiSTB has translated to Finnish the sample exams of the most usual exams, i.e. exams that FiSTB offers in Finnish. You'll find them in Downloads.
Sample exam is the most useful is you do it in the same max time as the real exam. Then you can mark the exam with the exam results and justifications information. Based on the results you can then rehearse the difficult parts of the syllabus.