Hey I just did my A level chem spa 1 and probably got like 4-5
marks deducted... Most people get full marks right?
Will this affect my final score in the As by a
lot? 
No use worrying about that now. Just take it as added 'motivation'
that, since you screwed up your SPA 1, all the more you have to
force yourself to do even better for the rest of your SPA and
written papers.
It's still possible you can still get your A grade overall. Now
quit worrying and work harder for the rest of your SPA and written
papers!