Solved

Car points

How are the car design points are reset for the next season

From in-game Help: Rules & Regulations:

Next season design:
Generated per-race by the current active Chief Designer
Can reflect a mix of contributions from multiple Chief Designers (all those hired and made active across a season)
The higher the star rating of the Chief Designer, the better the gains will be at each race

Also read: https://igpmanager.com/forum-thread_1/8281#61495

Thanks for the post. I have an another question regarding the tire setup before the race. Could you please give me the link for the same.

Well, what do you want to know?