Mastering the DS is possible with prolonged practice.
for number properties and inequalities, make sure you check these things everytime.
for any value X:
1) check fraction vs integer
2) check positive vs zero vs negative
3) check even vs odd
4) master your co-ordinate geometry and number lines. visualize the equations on graphs
Don't solve the whole question, take one statement at a time. If possible place some paper on options while looking at a particular statement. Gmat has limited number of permutations for DS type, try to master them.
Og and gmat club's quant tests are good source of DS questions.
Fight for your dreams :For all those who fear from Verbal- lets give it a fight
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Jo Bole So Nihaal , Sat Shri Akaal
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