3 year old speech therapy ?

Monica • One happy mamma! 😍 💙👶🏼

My son is on his 5th speech appointment and has said a couple new words with her but all together is just when he is frustrated and screaming at her. I keep trying at home specially the homework she sends home but it’s like he isn’t trying. And he started this screaming thing, think he got it from his 8 month old brother. He has an appointment with his doctor next week for an evaluation for autism but my question is how did anyone els kid respond in speech therapy? Is your kid around other people? My kids NEVER see anyone besides me, husband and little brother. Anyone has any tips that worked for you?