Droppers & experienced ppls............. Need some advice........

Ye batao bhai ki exam goal kyse beneficially use kru?? mne Google opinion rewards se jo paisa mila tha usse exam goal ka subs. le liye h but kch samajh nhi aarha h.......................12th ka board chl rha h and me sooch rha hu drop lene k liye........... plz aaplog batao ki konsi glti nhi krni h drop year me and kya cheez krna h please!!