Try to set some learning goals for each new shift.
Keep a log of "pearls" that you pick up.
Study, study, study.
While you're at home and relaxed, visualize a chaotic code... and picture yourself calmly making a contribution.
During the real thing, look for what's not being done... clearing space, getting another line, raising/lowering the bed, getting a stool for compressors, getting a board, spiking a bag of NS on a pressure bag, engaging the family, getting suction hooked up, bagging, putting in an OPA, getting flushes, setting up ETCO2
Pick your moments and pick your people but learn to chat up the docs... most young docs love to teach enthusiastic learners.
And remember, always go back to ABCDE and DOPE
And above all, never forget: Treat the patient, NOT the MONITOR... a patient can have decent vitals but look crappy as heck and be ready to crump... alternatively, the monitors may be screaming at you but the patient is still mentating and ventilating and perfusing.