back link ratio

hi all
in ahref tool its showing that my domain without www has 20% links and remaing keywords shows 4%.40 % are general keywords such as click here,jack,alex. etc but 40 % doesnt shown in ahref. i just mentioned overall count.highest is 20% in ahref tool. is this looks spammy.my targeted keyword also in 6%.is there any rules for this percentage.

There aren't any given rules or percentages, as long as you don't have any keyword above 20% you should be fine I think
just checked my stats and from 5k links only 2% is main keyword, and highest(mydomain.com) is 13%