Sounds like multitasking is at issue. As a law enforcement trainer, it is an issue I dealt with for many trainees - missing radio traffic or required observations/tasks due to fixation on another task. We use various exercises to get past it.
Commentary driving - trainee drives, describes what he is seeing to include cars (speed, description, activity), describing pedestrians, repeating all radio traffic to the trainer.
Rule of three - the trainee has to describe three things about every person we contact (victims, witnesses, the barista at Starbucks), and every location we go to.
Distraction - trainee is just starting a task (driving to a call, writing a report, whatever) and the trainer asks an unrelated question. Halfway through the trainee's answer, the trainer asks about the original task.
These are some basic exercises that are adaptable to flight training. Even with great multitasking skills, when I was a low-time student pilot, I would tend to focus on one thing and exclude other necessary input. Fortunately my CFI was an experienced one, recognized the problem and fixed it quickly.
Maybe try similar exercises and see how they work for you.