I will be heading into my 2nd semester of junior year as a mathematics major. I am curious about grad studies and how to prepare or to discover if i am capable of such a rigorous course. the video below is ment for humor but i believe the advise coould still be solid. a funny video on youtube, "so you want a phd in mathematics" sorry cannot post links yet due to being new. I have a bit more education than the student in the video, however that does not mean I know more about what is in-store for me. any reading material on a larger view of mathematics as a whole and/or how to ensure a solid foundation of mathematics would be amazing. Besides working problems of my mathematical level till im blue in the face, any other suggestions or helpful texts would be great. I do not have the education to quite decide on a field yet. Thank You.