Hello student,
If you have completed your Btech, you can apply for jobs in several companies. However, if you want to pursue Mtech you can do that as well, or you can start preparing for competitive exams such as GATE. If business is something which seems interesting, you can prepare for MBA as well.
You can start your preparation for civil service exam or if you want to go abroad you can start preparation for GRE and TOEFL.
You can do several certified diploma courses as well in mechine designing, ethical hacking, protocol testing etc.
You can check the link below to get an idea about the scopes after btech
https://engineering.careers360.com/articles/what-am-i-going-do-after-btech hope it helps
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