I think it's too much for 10/11yo's, and can't see why if there are going to be lvl 6 tests, which are essentially putting DC's in for tests to make the school look better, why they can't be sat at a different time to the rest of the SATS.
All the Secondaries do CATS tests in the first half term anyway, so the SATS are only really for the school's league table position anyway, so the obsession with the lvl 6 papers seems a bit nutso to me, just putting lots of stress on very young children unnecessarily.
I'm not 'stealth boasting', I have a DD that didn't get lvl 3 on her SATS in Y6, in fact she is working at lvl 3/4 in Y10 now.
It's just a fact that different DC's have different abilities.
DS1 is academic, DD could cook Gordon Ramsey under the table with far less swearing.
IMO, SATS are for the school, not the pupil, so I'm not over stressing him. He's already done the 11+ whilst ill this year (he insisted), THAT was for him, this isn't. I've just told him to do HIS best as that's all he can do.
Still too much for 4 days though, I think.