The correlation between the score you received on that test and reading seems to be overplayed, I think you should try not to let it affect your desire to read (if you have hitherto been an avid reader). Being a prolific reader is not necessarily a factor in someone being good at English Language as a subject. I studied literature and language in school and university but barely read any books of my own volition between the ages of 11 and 20.
Probably what you need is to find some books that are really up your alley in terms of genre/style to reinvigorate your interest in reading, but first and foremost you need to remember that reading is something you want to do because it's a pleasurable activity and not because it should be improving your grades. Don't put that pressure on yourself.
If you need to, set yourself some basic goals, for example, to read each day 1 or 2 chapters, or 20-30 pages. Whatever feels achievable. You can increase the goal once you have got back into the routine of reading a little bit.