Did you make your absolute best effort to achieve those grades? What A levels do you have in mind? What can you see yourself doing after sixth form/college?
i got 11 GCSEs, didn't finish my a levels, was worst decision ever not finishing. Had to go back to college years later to get the grades to go to uni. Do a levels whilst it's offered to you
Bear in mind that the 5 Cs requirement is a minimum for most sixth forms/colleges and, in reality, you'd need to be performing at at least an A/B standard at GCSE in the subjects you're doing at A-level.
This is for the simple reason that A-levels are much, much harder than GCSEs and the typical trend for a lot of people in the first year of A-levels is a downward one. If you struggle to get As/Bs in these subjects at GCSE, those grades are going to become even harder to get to at A-level.
You should consider all your options. What do you want to do at university? There are less academically demanding paths to university.