Hello Arindma,

Changing a mentor during initial phase is appreciable if you are not comfortable studying with them. If you are changing the mentor after a good period of time then it is quite hard for you to understand things from different mentor.

As you have mentioned that your mentor is lazy and skips classes. See, it is no doubt a big issues for sure  and you definitely need to work for this.

I think you need to talk with your mentor as your studies are getting affected and due to that you are not able to study properly so kindly be active while teaching.

After this if your teacher doesn't supports you and the problem remains same then you can change your mentor by a simple process.

As the platform is not mentioned in the question so I am assuming you are talking classes from various online learning platforms where many mentors teach different subjects so don't get worried but focus on what you can do now.

Hope you understand.

Thank you and all the very best:)