Things that really are worthy always vary depending on the persons. But one thing to be remembered for succeeding is Prioritising. Always try to optimise daily life spending time with things that will never regret and which have a positive impact not only you but for the society. No matter how organised a person is, they should dynamically change priorities as the need calls for it. Some of them are,

Acknowledging the past

Always it is quiet important to remember the roots. They reminds us that we are capable to doing anything. 

Studying

Just not only the thing which everyone does at school, Study is the act of analysis of anything. Think always like exploring the vast world of endless possibilities. Never stop questioning, and when you hit a wall, if someone tells you that you can't question something, question especially that. 

Maintaining a good hygiene

It helps a lot. It helps live a healthy life and to stay fit. 

Having a good family time

Family is always there starting right from as an infant when you started crying. They were there at your first cricket/football match, at you report day. You should be there for them. 

Expressing yourself

Don't hold back. You may never get this chance again. Ask her out, stand up for yourself, open up to your parents about insecurities.

Meditating

It always helps you get rid of all that anger which you have suppressed. It will definitely help you concentrate more in math class. 

Watching a good movie

Watch movies but not when you have your math exam the next day. But it will refresh you. Perhaps change the way you look at the world. A good movie doesn't just entertain, but make you question yourself, your surroundings and in some cases, your reality. 

Maintaining a journal

It makes you accept all your rants. Tell it about that nasty thing you did and it never judge you. 

Reading

Read all that you can. Being a bibliophile is a good thing. They say a person can live a thousand lives if they read books.  

Going for a walk

It refreshes you. Help you introspect and realise the beauty of nature.