sir what does descending order mean ?

please define it in brief ...

thank you...

srinivasgupta58980 Suppose let us take three clgs as example
clg A, clg B, clg C

Suppose
You want cse or ece in clg C
You want ece in clg B
You are strongly targeting clg A in whatever group it maybe

Then your choice filling will be like,
1.clg A
2.clg C
3.clg B


You need to give option which you consider it as a high priority.
Also do take suggestions from your teachers ,relatives they will help a lot.