Hello femalebooklover,

I am afraid there is no certificate when you complete the SAT Mission.  There is the rewarding feeling of accomplishment though.

To my knowledge, the US SAT is very different from the UK SAT.  In UK, years 3-5 take it while in the US, high schoolers, or grades 10-12 take it.  They are very different tests so please be careful when you try to do Khan Academy SAT Mission.

Hope this helps.