A good starting point would be to solve at least 5-10 sample papers, in addition to the previous year's question papers. You can download more than 25 sample + previous years papers here Download NID Sample Papers. As you progress with your preparation, you can increase the number of sample papers you solve, depending on your comfort level and study schedule.
It is important to note that simply solving sample papers is not enough - it is equally important to analyze your performance, identify areas of weakness, and work on improving them. Additionally, it's important to prioritize quality over quantity when it comes to solving sample papers, as it's better to thoroughly understand a few papers than to quickly skim through many without learning much from them.
Our SILICA Guides can help you with your preparation and doubts, please connect with them on: 08080809198