Can anybody tell me songs for alto that are in classical style and theater?

I am in a school that also teaches jazz singing but I have to transfer to one that only has classical singing. I know nothing about classical singing, I also need to do some in other language, I speak Spanish so songs also in Italian or Portugues are great.
Thank you

First off, be aware that "alto" is correct only in choral singing. If you’re still in school, you probably don’t have a contralto voice; you have a voice with incorrect technique that won’t allow you to hit the high notes.

Now for voices with limited range, you can try Handel oratorios and operas, Pergolesi’s Stabat Mater (a looooong duet for two female voices in Latin with songs both for duets and one voice alone), Purcell operas and theatre arias, Bach oratorios, and Gluck operas. Some of the nineteenth-century French operas are also accessible to those with limited ranges.

Let’s hope your new teacher will correct your technical deficiencies so that your true abilities are able to emerge.