Qaisar,
I think you should focus on studies primarily... then you should join any society... but remember, studies are your primary responsiblity... dont let the extra curricular activities deviate you from your original goal...!
If you will be good in studies, you will perform better in other fields as well...
Offer Salat regularly, participate in social work and other noble works, and ask for Allah SWT help.
May Allah SWT help you. Aameen.