The NDA (National Defence Academy) exam is a dream opportunity for students who are aiming to serve in the Indian Armed Forces.
It’s one of the most competitive exams conducted by the UPSC, with lakhs of aspirants appearing every year. NDA 2 2025 will test candidates not only in Mathematics but also in the General Ability Test (GAT), where General Knowledge (GK), including Chemistry and Biology, plays a crucial role.
Many candidates struggle to figure out which topics to focus on, especially in the science portion. In this blog, we’ll break down:
The trend of past year questions
The most important topics in Chemistry and Biology
How to make a targeted study plan to maximize your marks
Analyzing Previous Year Question Papers
Why Analyze Past Papers?
Studying the pattern of previous year papers gives you clarity about:
Which topics are frequently asked
The difficulty level of questions
How to prioritize topics
If you look at the NDA 2 GAT paper over the past 3–5 years, you’ll notice that Chemistry and biology consistently appear, with certain topics getting repeated almost every year.
Read More : NDA 2 Previous Year Solved Question Paper PDF Free Download
Detailed Trend Analysis (2023–2025)
Chemistry contributes around 15–18% of the GK section.
Biology stays between 10 and 11%.
These two subjects together can fetch you 25+ marks easily, if prepared well.
This trend tells us that if you master around 15–20 key topics, you can crack 25 questions confidently.
Understanding the Weightage of Topics in Chemistry and Biology
Chemistry: What Really Matters?
Chemistry is largely conceptual + application-based in NDA. Most questions are from basic NCERT concepts and key focus areas include:
Most of these topics are covered in Class 9 & 10 Science NCERTs, especially in chapters on "Atoms and Molecules," "Carbon and its Compounds," and "Chemical Reactions."
Biology: What Are the Key Concepts?
Biology in NDA focuses on basic understanding of the human body, environment, and simple concepts in life science. You don’t need to be a medical aspirant to score well here.
These are conceptual questions and often appear in “which of the following” or “match the following” formats. Most answers are direct from Class 9–10 Biology chapters.
Integrating Analysis and Weightage in Your Study Plan
Now that you know what to study, let us talk about how to study.
Mentioned follow-ups will help you see how you can combine the past paper trend and topic weightage into a realistic weekly plan: Solve at least 10 PYQs topic-wise after reading theory. Revise using flashcards or mind maps weekly. Maintain a mistake tracker to avoid repeating errors. Click Here To Download Pdf : How should I prepare for the GS section of NDA 2 2025? The NDA exam is not just about hard work it’s about working smart. With the limited time and vast syllabus, the key is to prioritize high-yield topics, focus on concepts, and do targeted revision. In the General Studies section of NDA GAT, Chemistry and Biology offer the easiest scoring potential—if you follow the trend and prepare selectively.
