Congratulations! 117 is a very good score whether top 1% or not, it shows he/she has great potential to be a good mathematician in secondary.
My DS had 120 in Sats math last year and 118 on average across the 3 subjects. In year 7 CATS tests he scored really high as well and has done 2 math competitons JMC and KMC and achived gold in both without much preparation.