Aparna D.

Firstly, know that every individual has their way of learning. Everyone cannot follow the same pattern to acquire knowledge. Hence, introspect and find out your learning style. If you can read for hours, you are a learner who understands concepts just by reading or writing. Besides this, you can also learn by watching videos or listening to podcasts. It will make you a visual and auditory learner. If you like doing experiments or other activities to understand specific topics, you are kinesthetic learners. Thus, it is you who will first have to identify your learning style.
It is only after this that you can concentrate on your learning. You do not need to study all day. Taking breaks by listening to music or watching comedy shows, relieves your mind from the burden and allows you to focus more. Discuss with your classmates the different topics that you find difficult or are interested in. Peer learning will facilitate the exchange of knowledge and will help you understand other's viewpoint. It will be beneficial for you to write answers as well.
You can also put out sticky notes on your cupboard and write short term goals in it. For example, finish a chapter this week. Short-term goals will help you focus on everything with equal attention rather than aspiring long-term goals that seem difficult to attain. Lastly, get adequate sleep. If you need more rest, that is also fine. But maintain good health because that will allow you to build your focus in a positive direction.