Hi anand123prk,
When students struggle with DI questions, the first thing I always ask is whether they have fully completed their quant and verbal prep. Not doing so can really affect how well you handle DI questions, as many of those questions involve quantitative and verbal concepts. So, would you say you are in that boat?
In addition, one way to improve each individual DI question type is to engage in topical practice. Doing so lets you pinpoint your weak areas in JUST ONE question type. For example, when practicing TPA questions, perhaps you see a pattern that you struggle with 3-part ratios or weighted averages. If you can find those micro weaknesses, you can fix them in real-time and thus improve your accuracy in DI questions..
Lastly, when working on DI questions, for the time being, make sure to practice them untimed so you can focus on JUST accuracy. As you become more familiar with these question types and get more accurate, better timing will follow.
For more advice, check out this article:
How to Prepare for GMAT Data InsightsFeel free to reach out with any additional questions.