How do we prepare our child for PSLE and avoid them taking unnecessary stress?

My son took his PSLE this year. The way we approached this was to firstly, not leave revision to the last minute, work with his tutor on focussing on the weaker topics that scare him, and to indulge in days of relaxation and sports - they really need to keep their minds of this "scary" examination, and remember that at the end of the day, they just need to do their best.