Hi, i am a newly interested self learner of QM. For now, i have the lectures of Feynman and i made a research about the beginning phase in PF and the feynman lectures and griffiths book are mentioned in few threads. First of all let me inform you about my math level. I am an engineer with masters degree, i took classes of calculus 1,2 differential eq. linear algebra, complex number maths, but i didn't use them for a while. I begin to follow the theoretical minimum of susskind's and for now mathematically it's straightforward, but before things are getting massy i want to revise my math knowledge, i don't want to skip any point, so shall i start from the basics of calculus and diff eqs. and so on or shall i directly begin with one of the introduction to QM books. If so, could you recommend any book?