My holidays

Hello Ms.
I am student at university, faculty of maths. I have summer holiday now. I am trying to use it correctly and so I am studying English vocabulary. It is really hard for me to decide which book will be suitable for me. I want to study modern words which are used now in England. I want to study British English but most books are written in American English. When I see how words that are unfamiliar to me I feel like I am a complete loser and I will never be able to study English as native speakers do. Do you have any kinds of tips for me? Please, every suggestion can be useful for me ❤❤
Your sincerely

My holidays

Hello Ms.
I am a student in unevrsity, majoring in math. I have my summer holidays now. I am trying to use English more correctly ,so I am studing more English vocabulary. But it is really hard for me to decide which book that is suitable  to choose. I want to study modern words which are used now in England. I want to study British English but most books are written in Amreican English. Also when I see how many words are unfamiliar to me I feel like I am completly a looser and I will never be able to study English as a native speaker does. Do you have any kinds of tips for me? Please, every suggestion can be useful for me ❤❤
Your sincerly