Hello Aspirant,

As per the official website and other related source,

You can apply for IES examination if studied B.Tech part time and your degree is recognized by the government of India.. In order to apply for IES/ESE exam, you should have completed engineering in any of the streams of mechanical engineering, civil engineering, electronics engineering, or electrical engineering. IES exam can be taken in any of the above mentioned degrees, even if it is part time.

Good luck