Help , Heavy pressure from Parents for exams ...

hi , I am 20 years , wasted my last 3 years doing nothing , I applied for ssb clerk which is just around the corner and i have not even started to prepare . Should i prepare for sbi clerk or start for anyhting else , bcoz I don't think 1 month is enough clerk preparation or is it ? IF yes pls provide guide or any stratergy .

Also i want to start preparing seriously for big exams like CGL OR PO , so suggest me which one should i go for and how should i start . My parent are pressuring me a lot and its getting very bad , I think i have to get one post this year .

Pls help

thanks ...