sayang naman... what i would suggest is finish CS first then i post grad mo yung ECE... para kung sakaling di mo magustuhan ang ece at least may natapos ka na...
I'm an ECE by profession and I love the course... soldering? nope... ala soldering subject and ece kaya nga kami inaasar ng mga tech students e kc pangit daw kami magsolder... You will just experience soldering pag may project na kailangan isolder...
Math? yes... you'll have a lot of those... algebra, trigo, anal geom, solid geom, diff calculus, integral calculus, diff equation, advance math, eng'g mechanics, strength of materials, thermodynamics, electronics 1,2,3, comms, logic ckts, data comm, enercon, ckts 1,2, and more...
lahat yan may math...
I dont know about your interests kaya di ko masabi na magugustuhan m sya... but what i like about ece is that it is super broad... you can do hardware, software or both...