Assalam o Alaikum

Firstly, sorry that i am taking your precious time but i need logic based suggestions which i think you can give. I have some questions.

My optionals
Physics
International relations
English literature
International law

I have studied physics till Fsc but later i completed B.A and M.A english as a private candidate, due to some health problems. I want to ask, can i opt physics on Fsc base? I found it interesting and its my favourite.

The other question is that international relations is only associated with foreign service or we can join any other group. Is this an easy subject because its totally new to me.

And also which note-taking app you have used in your recent posts. I liked its features.

Sorry again for taking your time. Please reply.

Thanks.