Hi Sandhya, initially studying physics everyone faces some problems solving numerical, that's not a big issue. You can do the following things to improve your numerical solving skills.

1. Understand the concepts of the topic first (for that you can look into the learnohub video available in youtube)

2. Try out simple basic problems, examples related to the topic.

3. Practice more and more basic easy questions first, then gradually increase your level of question

This trick will surely help you.