I don't know how Werder Bremen is going to perform in the Bundesliga but I have good expectations from Schalke. they have actually impressed me a lot and I hope they can continue the good work in the Bundesliga also.
But obviously, the experience in the first division is going to be a lot different than in the second division. they will have to improve and play a lot better if they want to finish at least in the top 10.
It also depends on who is still in the team, who is new. In addition, it is not yet clear who the coach will be. Mike Büskens is only the coach until Sunday. But we also have to consider that Schalke and Bremen have experience in the 1. Bundesliga. Therefore, I do not think that both teams will play against relegation again next season. But of course that is not certain.