@tanguatlay,
a) yes
b) no
I think "hope" is the proper verb to use, not "wish".
My hope is that all of you do well in the final-year exams.
My hope is that all of you will do well in the final-year exams.
I hope all of you do well in the final-year exams.
I hope all of you will do well in the final-year exams.