Hi guys, this is my first post in this forum, i joined mainly to get this doubt clarified, which would eventually decide whether i'll be a physicist or something else. I am doing bsc in math, i'm kind of interested in theoretical physics, especially cosmology and i learned that a sound background in math would allow me to join cambridge university's msc in pure math and theoretical physics program which can pave way for my phd henceforth. i read in some thread that despite getting admission to elite programs, if one does not had the opportunity to study some physics courses like classical mechanics, quantum mechanics, statistical mechanics and the like at under graduate level, it would be very hard for him to survive the first year of his phd, since, they stress upon these topics at advanced undergraduate/graduate level. now, if i want to go for the cambridge's phd (after my msc there), i assume there won't be any big trouble IN GAINING ADMISSION and of course surviving the first year of their phd. But, in case if i want to go to USA, i can sense that would be a huge trouble, that's what i infered after going through some pages here. so would you guys kindly advice me for choosing my options, my need being gaining admission at best schools in usa and helping my background so as to survive 1st year of my phd, and the coming years. you have to choose 4 out of these (i thought of choosing math physics 1, 2, 3 since it is mainly related to theoretical physics, but i seek ur advice, anything better?: Classical Mechanics I, II, III Electromagnetism I, II, III Mathematical Physics I, II, III Quantum Mechanics I, II, III Statistical Mechanics I, II, III Atomic and Molecular Physics General Theory of Relativity Condesned Matter Physics Nuclear and Particle Physics Quantum Field Theory Thanks for one and all and good luck with your endeavours!!