Future careers

Im about to start year 12 in september (with absolutley no clue of what im going to do ) Can i ask if anyone witn knwoeldge is able to tell me about the careers i could pursure in the future with maybe luxury companies , Dior , Charlotte tilbury , and i dont mean Working behind the counter in selfrdiges like what jobs am i able to get within those companies ?

I am not an expert in the luxury industry, but as they are businesses you typically get the standard business functions: accounting, marketing, HR, law, IT, etc. Most of the graduate schemes that I have seen for luxury companies tend to be in marketing, which makes sense to me because their image and reputation are paramount to their businesses. Their sales reps also need to convey a similar image, so there's that.
As both Dior and Charlotte Tilbury both sell makeup, you can guess they would also be looking for chemists and cosmetology,
Fashion, accessories, etc. don't require you to have a degree of any sort. In most cases, you don't need qualifications, just a really good portfolio and prove skills that closely align with their tastes.
If you want to work on their product designs, you technically don't need a degree (or any qualifications) but a degree in product design with a really really good portfolio won't hurt either.
You can also work on web development and design, but I haven't seen such companies advertise such for such roles before. I would only presume that they outsource this to agencies or contractors to handle and they focus on the main parts of their business.
Whether you would be able to get the jobs depend on a wide variety of factors beyond your qualifications. I neither know enough about the industry nor know how picky the companies are to give you an in-depth opinion on the matter. All I can tell you is that it's not easy and it's ridiculously competitive.
What I would need to point out is that any business related role won't require you to have any specific qualifications. If you do go for their graduate schemes and aim to get into these business related roles, you can get in with a degree in any subject (primarily because you won't need a degree in the first place).
You would likely need to know a lot about chemistry for working on their cosmetic products (outside of branding, design, etc.). Otherwise, you can pretty much go into any role in those companies with a degree in chemistry.
The above of course is based on my limited understanding of the industry and they are broad generalisations. If you can find a graduate who is employed by such companies, it's better if you ask them.

Thank you so much , do you think i could still get a reputable job within a company without a chemistry degree (obviously excluding the acutal role of making the formulas for the products) Im sorry it wasnt too clear