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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