biology or chemistry powerpoints

does anyone have any as or a level biology or chemistry powerpoints that i could please use

What exam board, and what do you need them for? If you want them to learn off, then there are definitely better resources out there for that. I recommend:

For chemistry:
https://www.youtube.com/user/MaChemGuy
https://www.youtube.com/channel/UCPtWS4fCi25YHw5SPGdPz0g
https://www.chemguide.co.uk/
The CGP student guide - you may be able to find a pdf version of it online.
https://www.physicsandmathstutor.com/ for practise questions and past papers

For biology:
https://www.youtube.com/channel/UCEFS1oWBiWN-6psYhFsQWuA
https://www.youtube.com/user/khanacademy - note this a us channel so would not be tailored to uk exam boards
Again the CGP student guide - but this is pricey, so try to find pdf version online?
https://www.physicsandmathstutor.com/ for practise questions and past papers

I take OCR A for both, so my recommendations may be more fitted to OCR A, however they are still good resources!