Focus techniques for those who get distracted easily

I have great difficulty focusing/paying attention (chronic distraction) when studying [CONTENT/TASK]. Suggest practical and realistic strategies: how to prepare the environment to reduce distractions, focus techniques in short blocks, what to do when the mind wanders, and how to make the task more engaging. Be compassionate and practical. (Note: if there is suspicion of ADHD, a professional can help with evaluation.)