Competitive Exams ...
One Word
Dictionary
do one's best
v.
1.perform as well as possible
 do justice   do the dishes   do the honors   do up 

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mediocre
ordinary; commonplace
We were disappointed because he gave a rather mediocre performance in this role.
meditation medley meek
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dispatch
speediness; prompt execution; message sent with all due speed
Young Napoleon defeated the enemy with all possible dispatch; he then sent a dispatch to headquarters, informing his commander of the great victory.
dispel disperse dispirited
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disparity
difference; condition of inequality
The disparity in their ages made no difference at all.
dispassionate dispatch dispel
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