Disadvantage is... After getting job you can get everything a year before like... Experience,  salary hikes. And also additional year for intermidiate makes u more stressed. If you get low score than earlier due to stress your entire year will be wasted in your career.

Hello dear, 

Please clarify what long term of jee mains you are asking for? 

Hi Gowtham, the major disadvantage of your question is that the pressure to be undertaken by a learner increases as time taken increases. If the candidate is unable to utilize the long term preparation he had taken for preparation, it will have a negative impact during his placement interviews as his capabilities and dedication will be questioned!!