In the CSE course list which course is the toughest?

[Zuberul]

waiting for my 5th semister final.
just feel curious.
by the word "toughest" i mean the course for which u spent much time & labour.

my pick.....

course name:

Mathetical Analysis For Computer Science.(3 credit)

course material:

probability models &
concrete mathematics.

[Tanu]

Hi man,
I think there is to word

"toughest"

Starting of everytihing is difficult ...
Thinking anything is wise ...
Working with new thing is pleasure ...
Ending of anything is joy and prepared for new one ...
Good luck....
Bye
...