I need A level math, but i took core igcse math

My teacher in the 11th grade suggested i opt for core igcse maths since i barely passed so i took it, however i realized that i need A level maths and I'm currently in the 12th grade and will take my AS level exams in about 4 months, I would really appreciate some advice on whether i should take it or not (and if its' even possible for me to self study it)

hey there, thank you for the reply! i forgot to add more information but currently I am not studying in the UK and I am in the 11th grade/ year 12, I barely passed extended math (my premocks in the 10th grade/ year 11**) so my teacher suggested me to go to core, in igcse core math i got a C

I barely passed because I was not able to cover most of the material and I had a lot of gap areas and I was not able to clear my doubts on math.

I mostly need A level math for computer science, as most unis require it, and I would prefer to apply to those that need it (and I just thought A level math would be a useful subject)

I know it is a risky decision to self study it, so I'm trying to keep other options open and wanted opinions on taking A level math

thank you for responding once again, the advice is greatly appreciated

edit: my A level subjects are computer science, english and art (and I'm considering UX design as a possible job, if there's anything else that does have tech and art together hopefully)

I barely passed because I was not able to cover most of the material and I had a lot of gap areas and I was not able to clear my doubts on math.
Well, covering all of the material is kind of important to getting a good grade...
I would still give A Level Maths a go, provided that you are able to do everything on time. 4 A Levels isn't easy and require a lot of prep and study.

I mostly need A level math for computer science, as most unis require it, and I would prefer to apply to those that need it (and I just thought A level math would be a useful subject)
Well I would recommend A Level Maths for anyone who is looking to study computer science at A Level. This then makes me wonder why did you picked English instead of Maths, considering it's a required subject for the degree?
Maths is one of the widely requested subject and can be used in a number of STEM degrees. Other than computer science, you have:
Outside of STEM, you have:
The above are worth noting if you intend to do something other than computer science/software engineering.

I know it is a risky decision to self study it, so I'm trying to keep other options open and wanted opinions on taking A level math
Well self studying it isn't easy. Getting a good grade in it is easier than self studying the A Level. You will require a lot of commitment, dedication, and discipline. I do a lot of courses outside of A Levels, so I am used to it. Not many people are though and it takes a while to get the hang of it.

my A level subjects are computer science, english and art (and I'm considering UX design as a possible job, if there's anything else that does have tech and art together hopefully)
Again, why English out of all subjects?
Art would take a lot of time. Even though it is relevant to UX design, it's really not a required subject.
Computer science is good to study for computer science degrees, but it's not a required subject. Maths is required, and you could get in with Maths + any 2 other subjects and not touch Computer Science at all.

Just to point out: UX design does not require you to have a degree in computer science. It's more of a design career than something technical (not that IT related careers require a degree in computer science in the first place, usually). You can get by just by applying for entry level roles in UX (usually asks for minimal entry requirements e.g. adequate iGCSE grades in particular subjects)
If you're looking for a qualification for UX design, something like a Level 3 diploma from a recognised college is sometimes enough. See the following for example: https://www.uxdesigninstitute.com/courses/ux-design

Other careers that involve tech and "art" include:
Note: if you want to become an architect, you would likely need specific degrees in architecture (at least in the UK you do). I would say it's worthwhile to do degrees in engineering, but it's not strictly necessary depending on the employer and the role. All other roles don't really need a degree of any sort, but it would help to have a portfolio to show off.
Also, at least in the UK, you can do degree apprenticeships, so it saves you from funding yourself through uni altogether whilst you gain work experience and some sort of salary. This is available for architect and engineer wannabes in the UK. Not sure what the case is for your country.

You can google for other careers involving art and computers using keywords such as "list of careers that involve art and computer".

I could still pursue interior design without math (it was what I initially wanted) but unis that are not top level even require it

Wait. Interior Design needs A Level Maths?! I'm very skeptical.

I just had a look at Interior Design courses at De Montford and Edinburgh, and they don't even require GCSE Maths!

Unless you've changed your mind about the course and looking to study something which does require A Level Maths?

At my school if you get a C below in math you cannot take it for AS/A levels, and if you take core math you cannot take it for AS/A levels as well, my teacher realistically advised me to take core math since I was not doing the best in math so I did, because of this I cannot take it anymore for AS/A levels

initially i chose computer science, english and art since one of my career counsellors helped me choose my subjects and said I could still pursue interior design without math (it was what I initially wanted) but unis that are not top level even require it (I'm also weighing down factors such as salary and demand etc.)

I know it's really late now, and that taking AS level math now would be risky so I'm pretty lost. If there are any courses you know that I can take that do not require maths can you recommend some please?