To begin with be dextrous with voltage and current calculation in a simple R network!
Study at RC and RLC circuits: time constants, rise time, falltime, stability..
General: gain, phase margin, gain margin, SR, input imp, output imp, small signal models, input and output offset, mismatch and in analog layout matching techniques.
Device char: working principle of BJT and MOSFET, CE, CB, CC, CS, CD and CG: input and output imp of all these configurations.
Analog Circuits: current mirrors (all kind of configs, advantages and disadvantages), differential amp (with nmos and pmos as input diff pairs, diff and advantages), opamps and compensation techniques and most importantly analog comparators.
top level: ADC and DAC architectures and working principles, bandgap basics..
I would expect a candidate to answer all these questions without hesitation if I am interviewing an associate analog design engineer!