40+ is definitely still possible on a technical level. You got that high A+ and the other A so you can obviously do it. Just do it again, twice.
Honestly, in four months, a good student can improve a metric shittonne. The best student I could ever conceive of contacted me last year, less than four months away from the exam. He dd everything I told him to do - worked like a dog at it, and he went from about a 6 IMO sitting on a 35 SS to achieving >40 with around 8s and 9s IMO.
Even my sister -- she didn't write any full practice essays in the revision period and the night before the exam she was fucked. We went through 20 or so prompts together, modified a piece she wrote for her context SAC and made an exam gameplan and she came out with 40 or something. That day was more a lesson of how to pull a dodgy, but the point is, you can make huge gains when you focus. (Disclaimer, my sister is naturally a decent writer. The other student wasnt though. He was a natural workhorse).
Just work at it diligently. Don't go "sweet it's stil possible I can just keep doing the same thing until it's impossible!" If you truly want it, you can still et it. But if you just "want" it and you're going to potter around for four months, chances begin to slim.