[HELP] structure of this french sentence?

[Peter En]

I understand what the sentence says, however... I do not understand the structure

 

ce n'était pas comme si tu faisais tant de fautes que ça

 

could someone explain to me where I would/should position ça? It's really only the position of ça that I don't fully understand...

[Neil Coffey]

The word ça is already in the right position. The construction tant de ... que ... means "as many ... as ...". And in this case, (pas) tant de ... que ça means literally "(not) as many ... as all that", i.e. "(not) so many ...".

[Stephen Bishop]

ce n'était pas comme si tu faisais tant de fautes que ça

What does it mean in English?

[Neil Coffey]

In English, something like "It's not like you were making that many mistakes".