how discrepancy in resistance values can be minimised?

You could put in a variable resistor so that circuit performance can be fine tuned once all the components are in place. You could also use more expensive components with better tolerances.

Aye, use 1% resistors.
They cost more though.

Do you mean impedance RLC?
Or purely a DC resistive load?
Most often in the real world pure steady state DC just does not exist, so in fact it's impedance that dictates, hence frequency and inductance and capacitance all play a part.

firstly, just wanna thank you all the reply. didnt expect an answer though.
well, actually this is just a school assignment. i was given for a table for the values of the colour-coded resistor. i have calculate their values based on the tables and then compared it with the values with the one obtained by using multimeters and circuits. i noted that there was some slight difference due to internal resistance. is that any way to minimise this discrepancy.

What calculations do you have to do given that they have provided the tables? Is it simply series / parallel circuits using resistors with a DC source? If so that's pretty easy.

You are never going to get the exact idealized resistance as given in the tables due to the tolerances of the resistors and the tolerances in the metering and the variances in the connections and the ambient temperature etc. Keep all connections as short and clean as possible.
Re-meter them over a few days and average the results if there are any noted variances.

thanks chumly!! i wonder what do you work as..haha