Can someone recommend a good source to practice circuit questions of semiconductor?

I am currently doing past year problem and unable to do most of the circuit questions without seeing solution
I am really weak in circuit involving zener diode,transistor

Have you tried dcp ?
There are lots of circuit based problem in subjective section and a few in intext and back solved example

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Thanks, will try it

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Most of them are from transmitter, but I wanted from zener diode

Why don't you check out subjective questions of very old IIT - JEE papers...there was a time when semiconductors was a part of the syllabus for jee adv. Those are really challenging!

DCP is enough