Physics A-level with B in GCSE?Watch
My daughter got a B at GCSE and an A* at Maths and picked Physics as her fourth AS level at the last minute. She enjoyed it, got a high B at AS, carried on and and is waiting for her A2 results. I wouldn't say that she worked excessively hard and it's been OK -though it has possibly helped that I've given her a bit of help when she's struggled.
I think you should be fine, I did fairly well in maths and physics (360 science) a few years back at GCSE and have just finished my A2 physics course. I think that if you are proficient at maths at this stage, you'll be able to cope with physics at a level (it's mainly just putting numbers into formulae tbh). I'd strongly advice taking maths as well as physics though at a level, it doesn't help much at AS but at A2 you use things such as natural logs which you will develop through doing maths. If you were struggling with the written content of GCSE physics, I wouldn't worry, it's completely different at A- level, you tend to only focus on a few topics in detail, and a lot of the questions are concept-based as opposed to just theory. Another thing I'd advice is using 'the calculations for a level physics' book, my school gave it to me, but I found it quite handy throughout the year.
I don't know what exam board you'll be doing, but the content is really interesting (imo), you learn some basic stuff in AS (like SNF and electromagnetic repulsive forces) and put them into use at A2 (considering nuclear fusion/ fission etc). I have to say its the only A level I really enjoyed, maths is also very good but physics you learn things that can be carried through to real life situations. BTW I did biology and chemistry as well. They were... Mehh... Okay I suppose.
Oh and buy the CPG guides for physics as well if you decide to do it (I recommend), they are really good at getting to the point!
Hope this helps a bit,