If someone does not earn themselves and lives with their father so
1) Is khums wajib on clothes and other things which were used for some year in the beginning but are now unused from few years (They were according to my social status)
2) Also is khums exempted from clothes and books (past papers or syllabus books) some of which I used and some of which were not used for years (I needed them in the years but somehow couldnot use them)?

1. Once you used it then khums is not wajib on those clothes or other items

2.If you purchased yourself or were gifted and not used for a complete year and if they have the value in market then you have to pay khums otherwise not according to ayatollah sistani. According to ayatullah khamenei khums is not wajib on gifts