it's going to be a tough game, Betis are looking to win to secure their 5th place in the standings while Real Madrid I think will play lightheartedly and will field some of their substitutes because they have already won La Liga and will prepare their core fitness for the Champions League final.
I think Sevilla are also aware of this as Real Betis are aiming for 4th place in the standings at the moment so Sevilla themselves will also play very well to win their last game with Athletic Bilbao and will still put Sevilla in 4th position in the standings because it is a the position they want and also a very good one for now.