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.
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