https://www.ea.com/games/real-racing/real-racing-3/news/november-update-career-and-car-changes

In our November update (7.0) we'll be making some changes to the Motorsports category in Real Racing 3!

Motorsports: NASCAR Academy Removal

As a result of NASCAR content limited time availability, we will be removing NASCAR Academy from the NASCAR Motorsport Series in 7.0.

The events in the removed NASCAR Academy will no longer count towards total career completion.

Any Gold/R$ you have not received via completion for NASCAR Academy will NO LONGER be attainable in 7.0.

You will keep you upgrades on the Chevrolet SS NASCAR Academy and can use them in the NASCAR Quanticfire Talent Tour Series. The car will be available to purchase from the Manufacturer select screen up until Tuesday, 1 January 2019 00:00 UTC.