query string analysis ?/

Question

Hi

well i know query string means . what it takes .. everything fine but i need help on this 

URL?sdsffeojsjdb%slcxa&1||b&2||sum1&2... it may be in a wrong format or whatever ..Any assistance is helpful regarding 

HOW TO UNDERSTAND DIFFERENT NOTATIONS IN THAT QUERY STRING & ALSO HOW TO GET VALUES FROM QUERY STRING ??

i Hope i am clear ...

My best wishes

Ty for help