Expect the unexpected would be my motto for both exams and warn the children (especially the high performing ones) that it will probably be the hardest that which has ever confronted them with lots of things they don't know. They should answer as much as they can in each section and then forget about it rather than dwell on what they couldn't answer and possibly spoil their next section. It's rather like a marathon where stamina and nerve are more important than quick flashes of brilliance.
Also they should ignore all the children in the break who are claiming to have found it easy. 90% of them are being economical with the truth.
Excellent advice, agree totally. Having seen the 2006 KE Grammar Raw/Standardised Scores table, the raw scores are significantly lower than convential NFER or Bond type papers