Okay, how am I meant to do this.

[Aztec]

How am I meant to do this? I have tried bouncing on the slime block. I tried jumping to the windows. I just don't know. I am on 1.8.9

 

[Aztec]

Am I just stupid or something?

 

[Tas]

Slimeblock to the slab. By the way, you'll have better luck posting questions like this in #parkour on the Discord, since you'll get a faster response and this doesn't always warrant a forum thread. Cheers!