Go home and..

There's no reason to continue with school. After Bianca left, leaving you confused, you decide to go home. But the question is, "Whose home are you going to?"

Your house, where the imposter Lasse is now and nobody is home,

Or your new home, Kaya's house? From what you remember, she was also alone after moving from her previous home to a new address close to Tim's house.

The first option suggests you want to go to your own house, meaning Lasse's house. There, you still have your dummy to help plan your next steps, or perhaps you could try something new. However, you're also curious about what Kaya's house looks like. You know she's smart, beautiful, and good-natured. Perhaps you could explore her house. No, it's your new home now.