Building a skin resistance meter (not unlike Scientology type e-meter)
Put component designators on all your parts.  They are missing from the opamps.

The + and - inputs to the opamps aren't labeled, so we can't tell if you got them right, and in some cases what you even intended.

You don't need all those gain stages.  The fourth opamp is completely unnecessary.  

The third opamp only has a single input shown.

The LED will clamp the supply to the LED forward voltage when on.  This is unlikely what you intended.  R9 is probably meant to be in series with the LED only, not the whole circuit.

The opamps need to be powered.

There is no bypass cap accross the opamp power, and it would be a good idea to put a bulk cap accross the power too.

The opamps aren't labeled, so we can't tell if it would work.  Plenty of opamps would not work in this circuit.



All in all, I think your general concept is OK after a little tweaking.  However, you need to be much more careful with the schematic, especially when you are asking others to look at it.  You'd never hand in a homework assignment like that, so don't dump it on us here either.  We deserve at least the same respect you'd show a teacher or professor.