Can I retake science GCSE and change it Foundation to higher

I want to do a level i picked biology and chemistry but turn out the need to 6 grade and I was too late because I do Foundation now and I'm doing my exams. can I retake it and change it to Higher?

You can retake the GCSE, but it would be after your exams. You might be able to retake it at your 6th form college, but it's more likely that you would need to retake it as a private candidate. In some situations, you might be able to redo it at a local adult college, but I would consider that as a last resort because it might affect your 6th form application.
I would focus on maxing out your grades in your sciences first though. If you want to convince your 6th form college that you are able to do the A Level (they will be challenging), then you need high enough grades to sway them to your case.
If you want to apply as a private candidate, it would depend on which exam board you would want to study with. There are 4/5 (5 because WJEC and Eduquas are supposedly distinct) exam boards for UK GCSEs, and I am not going to type it all out in just one post.
As you didn't specify what degree you intend to do (assuming you're going to do a degree since you mentioned those specific A Levels), I'm hesitant to say that the above would help you if you intend to become a doctor, vet, or dentist. If you are going for any other subject in life sciences, then the above should be of help.