It took 3 months for me to prepare and i used to spend 8 hours daily. About your Questions How important is I/O, gridbags,Layouts,applets etc.How much do u think in detail I must study,If at all they are important. I have answered this one in one of my messages below. Go through it.
Nothing? Or something? Like this tiny ad:
a bit of art, as a gift, the permaculture playing cards