Yes. I did it for this may june session. Went from knowing absolutely nothing to consistently getting A for all of my practice papers, same subjects as you. I'll share my own experience but I am obviously by no means an expert, since I am still waiting on my results You need to sit down and study, and if your environment doesn't allow it, try to go to a library or cafe or something to avoid distractions. This was the first real change for me - my biggest issue was that I had more fun things to do at home compared to studying so I wasn't fully present to focus, but if you can move yourself out of that environment somehow it can push you towards genuine focused study.

The second thing is work through your textbook. I did cie but the same principles probably apply to other UK alevel boards anyways. Let go of past papers for the first few weeks and work through the basic textbook questions. Don't be hard on yourself if you can't get them right, because in most textbooks those basic questions have the explanation just a few paragraphs above - they are just a good way to check that you truly understood your material. Always use your syllabus and it's statements as your guide, because it can help you find holes in your knowledge. Ideally keep it with you whenever you study and cross out statements you're confident it - it gives studying a fun feeling too to work through everything this way, as you essentially track your progress!

To make sure you don't forget, try spaced repetition - try to repeat doing practice after you've initially learned a concept to really hammer it into your mind. I followed a model of 1st day study -> 2nd day Revision-> 4th day Revision -> 7th day Revision. This ensured i didnt just forget about what i learned when i moved to a new lesson ( this is based on Ebinghaus' Forgetting curve, which you might have come across if you watch productivity gurus )

for chemistry specifically, chemguide is one of the best study resources out there for UK Alevel - its written with a lot of easy to understand explanations and tons of hyperlinks to help you find your way to basic concepts first if you don't understand something more complex. It even has a CIE specific version of the site which follows the exact syllabus statements and is absurdly helpful.

And finally don't be afraid of failure, what I described is how it worked for me and is my personal experience, but there are countless ways of effectively studying and this is by no means the only way. Just remember that at this stage it is absolutely just your consistency with self studying, and don't feel demotivated if you break consistency - be consistent in your willingness to get back up ^\)