Combined science

So I quit seperate science today, which means that I am going to be doing combined science higher. but there is one problem i have already bought my revision guides and i bought the science ones but i bought one for every science instead of the combined ones. Do I have to buy the CGP Combined Science revision guide or will the seperate science one be okay?

All the content you need will be there. Look carefully at them - some make it clear which bits are in Combined Science and which are 'extras' you only need for separate Sciences.

I'm pretty sure all combined science material is in the seperate science curriculum, so just open the spec when you're using the book and ignore the stuff that's not relevant to your GCSE. There is a checklist in the spec so just keep to that