If you're preparing for the set of exams under the title How to Clear All 6 DGCA Exams for CPL you should begin practising for the Navigation module as early as possible ideally from the very start of your theory phase. The Navigation paper is described as not only one of the most important but also one of the most challenging subjects.
Navigation heavily involves calculations chart reading plotting wind triangle compass errors etc.
Because of its numerical and practical nature delaying it often leads to last minute stress slower speed and more errors.
Practising early gives you time to build speed and accuracy which are crucial for clearing the exam on your first attempt in the broader How to Clear All 6 DGCA Exams for CPL strategy.
Early practice lets you identify weak spots (e.g. wind correction variation/deviation time speed distance) and revisit them before exam time approaches.
Start concurrently with your other subjects. As you learn Air Regulations TG Meteorology etc. begin a parallel schedule of Navigation numericals and charts.
A recommended timeline: by the end of your first month of study you should be doing at least a few Navigation numericals every day.
As you progress, increase volume: use tools like CRP 5 flight computer and Jeppesen workbook questions (as the article advises) to embed practise.
As the exam draws near make the Navigation module your daily revision priority while still pacing other 5 modules to align with the How to Clear All 6 DGCA Exams for CPL goal.
Starting early for the Navigation module gives you an edge improved calculation speed better concept clarity and reduced stress in exam week. If your aim is to excel in all six exams under the How to Clear All 6 DGCA Exams for CPL framework make Navigation a daily habit from the beginning rather than a last minute sprint.