In my opinion I wouldn’t go to a tutoring centre for English personally unless you are already a high performing student and/or if they offer some extra marking services, exam practice etc. I went to matrix for English like year 11 one term, the teacher was good no doubt, but I didn’t feel like all the time I was getting individual help which is important in English, so then I changed to an individual tutor and it was a lot more helpful. Tutoring centre and groups stuff works well for maths and science but for English I don't think its as good. But there are probably a lot of people it works well for considering they produce good marks so you will just have to test it out and see. If I was you I would go the centre maybe 1 term and then go to a private for a different term and see which one is best for you