Gap year and further maths at year 2 ?

I’m currently in year 12 doing A- levels Math, Chem and physics. My predicted grades are low and I made bad friendships which l didn’t focus on my studies.
But now I realised and I want a math degree in a good uni can be bath, Warwick or better.
I am considering to take further maths at year 2 ik it will be so hard but good unis what’s fm can I do it in second year?
And Im considering to take a gap year because I haven’t done any work placement or anything for personal statement.
What is your opinion about this, can I do further maths at year 2 and gap year.

The question seems a bit jumbled and difficult to understand.
I am considering to take further maths at year 2 ik it will be so hard but good unis what’s fm can I do it in second year?
Further Maths is an A Level. What exam board or modules you choose will be based on what your college decides to do.
If you want to do Further Maths independently, then that's something else.
And Im considering to take a gap year because I haven’t done any work placement or anything for personal statement.
The universities tend not to look into work placements too much for maths degrees - it's not like medicine, veterinary science, nursing, dentistry, etc. where getting work placements would boost your application.
If it's strictly for a maths degree, I think it's more to do with working under a mathematician. The more popular thing to do is to either read a lot of maths books or join a mathematical Olympiad (which unfortunately has age restrictions, so do check).
What is your opinion about this, can I do further maths at year 2 and gap year.
If your college takes you on for Further Maths, then yeah. Whether you can get a good grade in it is another matter.

I want to take gap year because I’m not doing further maths right now but I want to do it at year 2 and my predicted grades are low. So if I take gap year I can read or do another things and they will see that I took further maths

Sure, taking a gap year when you have confirmed your results would likely mean you have a stronger chance of getting in if you either have grades closer to what the universities are looking for or you have gotten higher grades.
Further Maths will more or less be expected if you want to apply for the more competitive unis for a maths degree. In fact, FM is the least you should do amongst a list of other things.
You will need to reapply via UCAS independently, if your college does not do it for you - it will essentially be the same application with a few bits and bobs in your personal statement. Your college will go through UCAS applications next year, so I would save everything you did research on.

Hi, I was wondering how you would get predicted grades for further maths alevel if you were to study it independently?

As far as I know, you don't.
If you are on an online FM A Level course and it says that as part of the course that you would be provided predicted grades, then you would get your predicted grades vouched by your tutor.
If you are buying the textbook and studying it all by yourself, you don't since you don't have a qualified third party to provide a statement for you.
In any case, universities tend to prefer achieved actual grades as opposed to predicted grades. If you are doing extra A Levels outside of college, then you are likely going to be doing it after 19 years of age or have already completed your other A Levels anyway.
Unless you're telling me that you are sitting another 3 A Levels on top of what you already did so you can apply for completely different degrees, the universities would likely be basing their decision on what you have done in your previous A Levels (or equivalent).

Ah I see. What If I’m applying to top unis that would want me to do further maths? How would this work?