Yes it is definitely due to the new specifications which for science have only been examined for 2018 and 2019. For exam question practice you can look at physicsandmathstutor.com which, despite its title, has some specimen papers for science, maths and other subjects.
Try also
https://www.wjec.co.uk/qualifications/q ... ?pastpaper which has tons of past papers from the old specifications on there.
It doesn't matter too much that it isn't the current spec (but check against the new specs so as not to waste time) as science is still science.
I would focus very much on recall of knowledge as well. A chap called Adam Boxer does a very good blog with excellent resources. Google "a chemical orthodoxy" and look for his SLOPs (shed loads of practice) by topic. If you Google biology and physics SLOPs you should find them for those subjects too.
Hope this helps.
Mrs C