I hope that I don't sound patronising but there are many bright, intelligent and capable people in this world who can't read or write and struggle with book learning. I wasn't a good student at school and scraped through, when I should have done much better if I wasn't so lazy.
But the commercial helicopter flying world which has afforded me a good living for 31 years requires that you do written exams and tests periodically throughout. I'm not aware of anyone who does private one-to-one tuition and I never heard of such.
Your best bet to pass the quite onerous ground exams is to attend a reputable place like Bristol Ground School and give up on drinking and socialising most days of the week until you pass. You no doubt already passed the PPL(H) written exams to get your licence, which will give you a feeling for the workload and you can multiply that load by about 5 times for the commercials.
Really there is no alternative route to the licence than hard graft, after which you still might not get a worthwhile job. So do you REALLY want a CPL(H)? You don't seem as if you're short of money now and you could spend a whole lot more, plus the effort and time to get you no further.