Cancel class again=.=

We supposed to attend for lectures from 4pm to 7pm this evening...
When everyone are waiting in the auditorium,our class batch suddenly told us that both of our lectures are cancelled and may be replaced...
OMG!~Yesterday,the same thing happened where the lecturer didnt appear although we waited for half an hour in the lecture hall and eventually someone went to called her but failed to approach her and the class is replaced on tomorrow...
What happen to IMU system?Our classes are always not following the time-table...
This is ridiculous!!!Next week we are going to sit for exam already...
Besides attending the usual lectures that had been planned for next week,we have to replace for this week classes again...
How are we going to have enough time to revise for our exams???...
Everything that is thaught before the day of exam will also be tested in our exam...
We have to study for it as well but if next week is fully occupied by classes then where we find our time to study T.T...
I feel dislike to the irresponsibility of those lectures who always postpone or absent for our classes...
Grr...Grr...