Good rubber is essential for wet weather riding and it is even more important to closely monitor the ever changing road surface.
A good simple rule for the wet: If the road is shiny, it’s slippery. Worn roads with tar bleed have reduced grip. Not unrideable but extra care needs to be taken.
Reduce speed and lean angle when cornering. Be smooth.
I observed that most vehicles, especially in heavy rain, drive with their headlights on which is great. The problem with this however is that the ones without are harder to see. So with limited visibility take care when passing.
Always expect the unexpected and be prepared. We hope to see you on a course soon.
Until then, enjoy your ride.