the people told you correctly.
Film studies and photography are both weak Alevels - as in they are fun, but not and sometimes challenging (in terms of work-load certainly) but they are not academically challenging at all. Universities know this, and the top universities will look down on you if you have two very soft subjects out of 3.
I worked in a secondary schools creative department (arts+music+media) for a few years, and from first hand experiance on the staff side, and the student side - they are not great Alevels.
Phillosophy sounds better... but to be honest you need to look at your attitude to education. 'It just eems like so much work' and 'It would be hard if I find i'm not that interested' etc. so what? The high probability is that you will spend your working life doing things that your not passionate about.. and if you want to maximise your chances of actually getting into work that you care about, sacrificing yourself a bit now while your young, is often essential.
Photography is great - but you don't need to study it at school. Its one of my hobbies personally - I love it, but I never studied it. And do you know what? None of my friends that did, ended up as photographers.. most barely even touch a camera now - me though, treating it as a hobby.. I have been working on it for 10 years, own multiple cameras, take them everywhere with me, develop all my own film etc. - because photography (and a lot of creative persuits) if you are passionate about it, you will do it on your own, without a teacher pushing you.. if you love it, you will go out and do it - and with the rise of the internet, and how much information there is to learn photography online, there is no reason at all for it to be one of your Alevel choices. If you want to learn it - get a camera, and go watch some youtube videos as a start. take it from there.
Film is great - but again, most film professionals and hobbiest, don't study film! not at Alevel at least. Even if you want to get into film work, or the BBC or something similar, a good set of academic Alevels with a side-passion of film, would be vastly supirior. Show them that you have your academics nailed, and that in your own time you have the passion for your creative persuits.
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It sounds like you like english, and then your just picking things that are fun to go with it - which is a very poor idea, and I hope your parents or someone else can give you gidance on this.
If english at university is your goal - then I would say:
English litterature
**humanity subject that involves essay writing**
**your choice**
is a pretty good way.
So, english lit, phillosophy or history, and then art/film etc. would be decent. replace the fun subject with a science/maths if you really want to aim for the top, and are willing to sacrifice more of your happiness.
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Remember though - sacrifices now, pay off later. most people my age (late 20s) can testify to this.. on average, the kids who put 'fun and what they liked' over 'hard work and useful' - ended up in jobs they hate that don't pay a great deal. The people that worked hard? most are still not in jobs they would ideally choose, but on average they earn more, and are in more respected professions. Work hard now - enjoy the bennifits through your working life, which is far far longer