I am currently a first year physics undergraduate in a obscure university in a obscure country. My goal is to continue on to obtain a PhD in physics from the best university I possibly can in order to put myself in the best possible network of researchers and academics so I could maximize the quality of my own research. However there are a couple of questions I have.
a) Considering the fact that I've failed my first year at the university and am retaking failed subjects, how is that fact going to affect my prospects of continuing my education (Masters and/or PhD) ?
b) Since it impossible to get research experience as an undergraduate in my country, what can I do to make up for that as an undergraduate?
c) How actually is important undergrad GPA for graduate studies? How are GPA scores interpreted in admissions, meaning what admission officers use them for?
d) Considering that my interests are in theoretical physics, is it really important to be in a high ranking institution, and if so why?