deadlines for completion of task are good? or bad??

see there are some cirumstances on which the task has to be performed i hv a deadline for any task i knew i hv to do it well with a significant result too under that given tenure if i m fail doesnt matter becz it will push me to go further for sure i may fail again but 1 thing is also for sure i will work better than last one and success ratio will be much better than last one no w yr question is it good or bad fr me challeges makes u always better compare to non challenging situation may be u will fail but u will be better than before fr the new task for sure