When to read 1.5

I didn’t realise it’s best to read out of chronological order. And that most people say to read 0.5 and 1.5 after book 4. I read 0.5 first and have just finished 1. I kind of want to read from the boys perspective and read 1.5 but I don’t know if I’ll regret it and should read 2. Is it best to save it ?