1. Where vs. When vs. In Which
Who vs. That/Which
That vs. Which

2. Where vs. When vs. In Which
Where is for location; when is for time
Examples of INCORRECT sentences:
Aristotle lived during a time forefathers were duly honored and cosmology lionized.
when
where
My favorite books are those the main character dies with valor.
in which
where

3. Who vs. That/Which
Who is for human beings; that/which are for non-human beings.
Examples of INCORRECT sentences:
The animals had not yet been fed were released from their cages.
that
who
The army general and the naval lieutenant, had fought together extensively in the Burmese encounter, were strongly allied.
who
which

4. That vs. Which That= restrictive clause
Generally speaking on this test, put “which” after a comma.
That= restrictive clause
Gems that sparkle often elicit forgiveness.
The words that sparkle restrict the kind of gems you're talking about. Without them, the meaning of the sentence would change.
Which= nonrestrictive clause
Diamonds, which are expensive, often elicit forgiveness.
You can think of a nonrestrictive clause as simply additional information.

5. Now you try
My favorite kinds of stories are the ones where the underdog wins.
The car which is yellow with red stripes is going to win the race.
The giraffes who were shorter could not reach the leaves on the trees.
The man that had the blue shirt on was chosen to go first.
Once upon a time, where all technology ceased to exist, there lived an old woman in a shoe.

6. I didn't know when I lost my bracelet until the mall security office called and told me that they had found it in the ladies room.  
The person is not confused about the specific time when she lost her bracelet.  If she was, then finding it in the ladies room would not solve that problem.  Clearly, since she is referring to the physical location of the bracelet, where should be used instead of when.
April the first is known as All Fools' Day where people play practical jokes on each other.

7. This method is more suitable in cases where users' needs are well understood up front.
It was from that moment where I started to have doubts about him.
Scientists continue to conduct extensive research regarding the Paleolithic Period, in which Neanderthals roamed the earth.