Mockito Junit testcoverage removal of unit test coverge

Hi recently we have done the unit testing for the entire project using mockito framework. My project is on Java spring rest project. But the coverage is below 35%. Need to improve the unit testing coverage.
1. Want to remove the unneccesay package from the code coverage, list test packages and beans class
2. Do we need to write the unit test case for the controller class and generated class from the tools.