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My job is usually concerned with Data Entry/Analysis. I work with a lot of data in Excel spreadsheets, prepare lot of Reports, requirement documents. I have to remember a lot of facts/things . I write them down in my notebook, still I have noticed that when I am doing my task, I don't even look at the notebook and enter wrong data, for example into a Web signup form. It causes serious mistakes, for which I am sharply rebuked and even can lose my job.
There is also lot of distractions from my colleagues. Someone or the other is calling me all the time for some meeting or a task. I can't say no to that also, as it's a part of my job! Please provide my some techniques/method which can help me be laser focused on my current task, so that I don't leave room for serious mistakes. Also provide guidance on productivity or time management and link reference material.