Hi, I'm a year 13 student. I take Physics but I'm on the OCR A specification: hopefully this still helps.
Physics is absolutely fantastic, I love it. I revised from the start by making summarised notes and flashcards and practising questions for each topic. This has helped so much and I really recommend this method.
Some topics can be tricky to understand, so make sure you invest time into areas you're unsure of - there are so many resources online to help you understand, and you can always ask your teachers to explain something for you in more detail. Even the most profound physicists will find some topics absolutely baffling because that's just physics. Regardless, it's definitely manageable.
In the OCR spec, there is a wealth of practicals that we have done. Those that are titled 'Required Practical' count towards the practical element. In these lessons, our teacher demonstrates what needs to be done and we are given an instruction sheet and we just crack on with it. Towards the start of the A-level there is a lot of support with the required practicals, but towards the end we have more opportunities to be independent in our designing of the experiment and analysis of results. If I'm correct, the teachers observe us/our results and tick off skills on a checklist as we go along - for example, can the student use Excel to record data and plot a graph? The result at the end of the course is a pass or fail - did the student achieve all skills? If not, it's typically no problem, because your teacher can just ask you to pop in over lunch to repeat the experiment so they can tick off the skill.
(If it helps, I take AQA Chemistry and the practical element is the same).