Good luck, Sian.

I'm sure you'll be fine, but if you slip up, it's not the end of the world.
Remember SATS were introduced to test how well the teachers teach, not how well each individual has done. Most employers won't be interested in SATS results, just GCSEs and A levels.
Sorry if I sound a bit soap boxy, but I get cross when teachers put so much SATS stress on students, even the 7 year olds at our primary school.