You should devote all your free time to doing as much research as possible,mainly because you want to listen to your parents and always try to be a better person.I also spend time on part-time graduate training to help students review theses and defend theses at graduation.I have been learning foreign languages,until the IELTS level,recently passed the examination,vocabulary is more than 10000,but my listening and writing skills are poor,and I need to improve.I am often laughed at,but judging by my vocabulary,I am slowly changing,and the time for qualitative change will come.