Cant pick 4th a level

If you're going for top unis then either history or physics will be more well-respected, but then again they are both a lot harder and/or work heavy than economics. If you think that would jeopardise all your grades then you should take econ. If you know you can handle a lot of work then maybe physics. If you don't like what's in the history course then you will find it really difficult to get through as your motivation will be very low, so physics might be a better option.

Look in to the different Medicine courses you are interested in - What are their entry requirements? What courses do they want you to do?
Physics sounds like a good idea, and remember that studying and attending classes will hopefully get those hard concepts to click in your head. If you feel like it would benefit your application to study Medicine then go for it.
You might like History, but if you know already that you aren't going to enjoy the content then I wouldn't recommend it. I mean if you don't enjoy something you'll be demotivated and your workload will suffer. Don't feel you have to pick it just because it might possibly impress Cambridge.

If you're hoping to go to Cambridge to study Medicine then note that in regards to A-Levels:
Applicants must have AS or A Level passes in Chemistry and two of Biology/Human Biology, Physics, Mathematics. At least one pass must be at A Level.
Most applicants for Medicine at Cambridge have at least three science/mathematics A Levels and some Colleges require this and/or particular subjects.
See individual College websites for details. Although some Colleges consider applicants offering only two science/mathematics subjects at A Level (or equivalent), please note that the success rate of such applicants is much lower.

(Including Oxford just to give another Uni's Entry requirements, for your consideration)
Oxford:
A-levels: A*AA in three A-levels (excluding Critical Thinking and General Studies) taken in one academic year. Candidates are required to achieve at least a grade A in both Chemistry and at least one of Biology, Physics or Mathematics.

Do what you will find interesting, not what you think the universities will prefer.
As long as you have Biology and Chemistry you can pick whatever you want for your 3rd. You don't even have to do 4 (because the 4th AS is no longer a requirement since most schools are only allowing people to choose 3), so if you can just stick with the 3 you're set on.

Do what you will find interesting, not what you think the universities will prefer.
As long as you have Biology and Chemistry you can pick whatever you want for your 3rd. You don't even have to do 4 (because the 4th AS is no longer a requirement since most schools are only allowing people to choose 3), so if you can just stick with the 3 you're set on.

But im applying to sixth form and all the application forms require you to pick 4.

Also, im not sure what i would enjoy as i have no idea what economics i like at a levels as i ahvent done any business gcse or anythign similar, i did history and enjoyed it a lot!! Im nto sure about physics because ie njoy some topics and im not sure what physics a level is like.

I did gcse history last year, and i completed the whole course in only 1 year and i cmae out with an a* and i didnt find the course ahrd at all, i found it quite easy and i would get a* in all my tests during mock exams, and i even got 100% in one of the exams in the actual gcse exam. Im not sure if i think i would nto enjoy it or i mgiht end up enjoying it, btu i dont like british history i like american hsitory, as i think its mroe interesting as at gce i did the roaring 20s, the greta depression, the vietnam war and the cold war.I dont know what do you think. im doing physics now, but then im worried at a level if ie dn up with a abd tacher i mgith struggle, btu then i want to go to a top uni and dont want to take a subject that is considered weak and not highly respected by unis, but i think i might enjoy ecnonomics. By any chance i knwo geography and economics are different subejcts but is a level economics kind of simialr to gcse geography, just slightly? I did gcse geography and i cmae out with an a* but it was due to em ahving to do the work by myself as the teacher was bad and i just scraped by and it was a very weak a*.I also found history easier than geography and i found it easier.

Well it sounds like you are the kind of person that would just power through an A level even if you didn't like it, so history might be fine. British history is incredibly boring, that's what I'm doing right now and im losing motivation fast. I've heard physics is a very hard A level so I would consider it very carefully. I personally love economics but just not sure of your chances for very competitive courses like medicine at cambridge if you took a non-facilitating subject. I didn't do geography gcse so I couldn't tell you if they are similar.
Sounds like history might be the right choice?
You could also get advice from your school who should be able to tell you the best subjects for your planned course.

Thanks for your advice. If you dont mind me asking what exam board do you do and except british history what other topics are there to do? Physics is quite hard and im starting to think and contemplate maybe if i would find history better as if i find physics hard i will end up spending too much time revising it and its not a subject im going to do after a level and it would mean i spend time revising maths,biology and chemistry which are already really hard subjects and history might be an easy subject for me and respected by universities and i would have more time to spend on my other a levels, do you think thats a good idea, or should i just pick economics, like how much is economics looked down upon by unis like cambridge, and does history have a large work load can you tell me more what a level history is like i would appreciate it so much, and what other a levels do you do?

My history exam board is edexcel I think and for AS we did the Soviet Union and Mao's China, and now for A2 we're doing the gain & loss of the British Empire and for coursework the American war of independence. I understand about physics. I think physics would be harder to understand so you'd have to spend a lot of time working on it to get your head around it but then again the sheer amount of stuff that you have to memorise for history may take a long time. It's difficult for me to advise you because you're obviously someone who is good at maths and sciences whereas I am really not so I would always choose something like history over sciences or maths. I think you would be fine with history though. If you can write in a coherent way then you will be fine. I quite liked AS, China I found really boring but I think it was the teacher. Empire is incredibly boring for me but America is alright.

In terms of economics, I don't really know how it's looked upon. I know someone who's just applied to oxford and is doing economics but I don't really know how it affects your chances as I'm not applying to oxbridge. All I would say is that top unis have their list of facilitating subjects that they recommend you take at least two of to be in with a chance, but you may be competing with people who have taken four facilitating subjects. In the end I think your predicted grades and strength of your personal statement will matter more than if you take one non-facilitating subject. Economics is pretty well-respected I think, it's just not a facilitating subject!

I am doing economics, history and spanish. Feel free to ask me more about any of them.

How would you say a level history compares with gcse, in the terms of the amount of things to learn and how hard it is and what its like?