Hi I was just wondering how had it is to get all distinctions in access course to science
Hard relative to what? If you have done A Levels before, then it's not that difficult; just a lot of work. If you have done a degree, then it's relatively straightforward. If you have done a master's degree, then it's a doddle.
I do psychology a level applied science extended certificate and health and social extended certificate
Then you should find it relatively OK. It's more similar to the BTEC than the A Level though.
I would focus more on the grade descriptors and assessment criterias when doing your work than just focusing on producing the work according to what you think they are looking for.