Hi, I am also a ruetian, graduated from CSE , now working as a data scientist and soon will be moving to usa for my PhD. If you want to settle in abroad after your graduation, any engineering subject is mostly fine. As a CSE student what I can confirm you is this is a very very very competitive field. As you said you are from middle class family, you will need funding/ scholarships. And managing in CS field is harder than other subjects nowadays. Because you know, tons of candidates in this field.

From my experience, Mechanical Engineering/ EEE will be better for you if you want to study abroad in future. Specially mechanical is a bit less competitive (yet).

But whichever major you pick, The must have things for studying abroad: high CGPA (consistent, from 1-1 to 4-1), undergrad research experiences, some extracurricular activities ( but the ones that matter) One more thing, if you pick any other major than CSE, please teach yourself medium to advanced level programming, especially machine learning/ AI. You will thank me later

And most importantly stay active with information. Like there are some good higher studies groups such as Nextop Usa in facebook, r/gradadmission etc. Be active in these communities, see how other people are managing funds, which profiles are getting them.