Help regarding TEC

So guys , I recently got 35/50 in cat1 for English and been kinda low since then, the part that pisses me off more is that my own classmates who speak dogshit of a English , atleast verbally, have got 44-45 , likeee it's something I can't even think of , has this happened to any of the seniors before?? And now that its just grammar and writing , how do you guys study and approach the question?? Any help would be appreciated 👍