Is there an app for my Android phone which can improve the quality of voice recordings?

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Hi,I am a university student and I want to make some audio notes during class. When I record something on my phone I have three issues with it:

Background noises

Voice quality

We don’t have contracted phones in our country, so I have a Qmobile which is not renowned for its quality of mobile parts.

Is there any free app or software in which I can filter the voice of lecturer and remove all the clutter from background (like the ones used in movies to filter out the voice of actors and actresses) and yes I have tried many Android apps and I can’t take my laptop in university due to security reasons.

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