WordPress optimization (Google PageSpeed)

More than 80 customers were required in Google PageSpeed.

I have increased PageSpeed:
Mobile version from 14 to 84
PC version from 19 to 94

https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fwww.singaporemathsacademy.co.uk%2Four-ethos%2F&tab=desktop