Once you have completed your engineering, if you still feel like studying, you can go for higher studies, no issues with that. However, after engineering, if you want to do a job, you should start paying more attention to your studies now and also start exploring various companies and their requirements.
Students usually find it difficult to pursue higher studies once they start working. So, it's purely a question of your choice & interest.
"If you want to make real progress, you must give up all ideas of personal attainment".