Speeding ticket

I️ got a speeding ticket and the officer said I️ was going 95 but I️ know damn well I️ was going 80 on the freeway so I️ want to fight it. Plus their was 3 other cars by me going the same speed as me so how would he be able to tell if that was my car if I️ was going that fast. ( even though I️ know I️ wasn’t ) The ticket is almost 500$. If I️ fight it and win do I️ still have to take the traffic class ? And will it be on my record ? It’s my first ticket ever I’m so damn frustrated....

I️ live in Cali btw