Pursuing graduate-level theoretical physics with a focus on Quantum Mechanics requires careful consideration of undergraduate programs. While options like Mathematical Physics, General Physics, and Astrophysics exist, the best choice largely depends on individual interests and the specific field of physics intended for further study. Quantum theory is integral across various physics disciplines, excluding biophysics, and is utilized in areas such as condensed matter, optics, and cosmology. Most undergraduate programs typically offer a general physics major rather than specialized tracks, with some institutions providing separate paths for astronomy or astrophysics. However, the key factors for success in graduate studies are the courses taken, the depth of understanding achieved, and the quality of research opportunities available, which can significantly differ between institutions.