Oh!   My math test only have 29 marks............

However, the full mark is 30 !!!!!!

 I wrong this:  (2x+ 3) (-4)  

I forget to add the bracket.  If I miss this step, I can be full mark..

The test is not very difficult.

 And I join the Spanish class during Tuesday lunch time

It is free because there is an old boy donate money to school to open a spanish class.