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In which area are you trying to study or master? Grammar, punctuation, sentence construction? You see, it's quite a broad field and you need to identify where you feel you are weak or need improvement at. If you are trying to do a general study, enrol on a course in Basic English construction.
I think you have to use a professional teacher or serch in the internet for such issues
Go for renowned website offering such tests. Take a hard look at what the test is all about and what it exactly measures. If it suits your requirements and if it is free, go for it!
Avez-vous besoin d'aide pour créer un CV ayant les mots-clés recherchés par les employeurs?