unable to improve score from 15-20 even in mocks with easy quants section like DASHCAT 12 . Any suggestions ?

Bro keep the spirits high and it all depends on your final day strategy, So yes Jai Mata Di

you can either practice a lot of arithmetic questions (time speed distance averages ratio proportions mixtures solutions time work) make sure you master that which will account for atleast 10questions pushing score to 30 rest of the topics like mensuration and coordinate geometry are all formula driven and does not need any prep , finally logs and surds always show up in cat and they are always on the easier a little critical thinking will help you solve it provided you are aware of all the formulas.

Jai mata di