You actually don't have to, on level 30 you will unlock S.V.Challenge and 3 Golds grind you exactly from 30 to 35 level. Thats around 1.800.000 Exp points for those golds, i cant remember how much exactly but Monza is like 900.000 exp and Suzuka more then 1.000.000 exp
When i unlock Vettel i automatically stop play other races and did Gold, that took me from 30 to 35 level without playing any other race
I have the same thing in a file I created. It will also tell you the XP required to get from any level to any level. It has many other lists included as well, like event grinding formulas and track and car lists. I'm hoping to make it into the only file anyone will need
Although off-course Vettel took a three days of trying but it was worth it. 👍 After that i smile at my self, told damn I'm good and continue with other races