Everything You Need to Know for Your Class10 Science Exam

? February 25, 2026

Stop Everything! Read This Before Your Science Exam

Last-Minute Strategy That Actually Works

Listen, This is Important

Your Science board exam is in a few days. You have studied hard. You know the concepts. But here is the truth: knowing the answer is not enough. You need to write it the right way to get full marks.

Every year, thousands of students lose 15-20 marks not because they did not know the answer, but because they made small, avoidable mistakes in presentation.

This guide will help you avoid those mistakes. Read carefully. Follow exactly. Score better.

⚡ Physics: The "Unit & Diagram" Warning

80%

of marks lost in Physics are due to missing units or poorly labeled diagrams

Let me tell you about a student named Rohan. He solved a numerical perfectly. His calculation was correct. His formula was right. But he wrote "Resistance = 5" instead of "Resistance = 5 Ω".

He lost 0.5 marks. That does not sound like much, right? But across 6-7 numericals, that becomes 3-4 marks. That could be the difference between 85% and 88%.

The Physics Rules You MUST Follow

Rule #1: Always Write the Unit

Not just "Current = 2" → Write "Current = 2 A (Ampere)"
Not just "Power = 100" → Write "Power = 100 W (Watt)"
Not just "Resistance = 10" → Write "Resistance = 10 Ω (Ohm)"

If there is no unit in your final answer, you lose marks. Every single time.

Rule #2: Label Every Part of Your Ray Diagram

When drawing ray diagrams for mirrors or lenses:

Label the Principal Axis
Label F (Focus)
Label C (Centre of Curvature)
Label P (Pole)
Mark the Object clearly
Mark the Image with a dotted line if virtual
Use arrows to show direction of light rays

Quick Physics Checklist Before Submitting

Did I write the unit for every answer?

Did I label all parts of my circuit diagram?

Did I use a pencil and ruler for diagrams?

Did I show all calculation steps (not just the final answer)?

Did I write the formula first before substituting values?

Real Example: In the 2025 board exam, there was a 3-mark ray diagram question. Students who labeled all parts got 3/3. Students who drew correctly but forgot to label got only 1.5/3. Half marks gone just for missing labels.

Chemistry: The "Balanced Equation" Rule

Here is a harsh truth: An unbalanced chemical equation earns you zero marks.

It does not matter if you got the reactants right. It does not matter if you named the products correctly. If your equation is not balanced, the examiner will give you zero.

The Chemistry Rules That Save Marks

Rule #1: Balance Every Chemical Equation

Wrong: Na + H₂O → NaOH + H₂

Right: 2Na + 2H₂O → 2NaOH + H₂

Check: Are atoms equal on both sides? Sodium (2=2), Hydrogen (4=4), Oxygen (2=2). Yes? Good. Move on.

Rule #2: Always Mention Physical States

Never write:

CaCO₃ → CaO + CO₂

Always write:

CaCO₃(s) → CaO(s) + CO₂(g)

The states matter:

(s) = solid
(l) = liquid
(g) = gas
(aq) = aqueous (dissolved in water)

Chemistry Answer Checklist

Is my equation balanced? (Count atoms on both sides)

Did I write the physical states (s, l, g, aq)?

Did I mention the color change (if any)?

Did I name the products correctly?

Common Mistake: In displacement reactions, students often forget to balance. For example, writing "Zn + CuSO₄ → ZnSO₄ + Cu" is correct, but many write "Zn + Cu(NO₃)₂ → Zn(NO₃)₂ + Cu" without checking if nitrogen and oxygen balance. Always double-check!

Biology: The "Keyword" Secret

CBSE examiners have a marking scheme. In that scheme, there are specific keywords they look for. If your answer has those keywords, you get marks. If not, you might lose marks even if your answer is "correct" in general.

Keywords That Examiners Want to See

Stomata

Chlorophyll

Hemoglobin

Nephron

Synapse

Hormone

Enzyme

Phloem

Xylem

ATP

DNA

Mitosis

Example: How Keywords Change Your Marks

Question: Explain how plants lose water.

Weak Answer (2/3 marks):

"Plants lose water through their leaves when it is hot."

Strong Answer (3/3 marks):

"Plants lose water through transpiration. Water evaporates from the stomata present on the leaves. This process is faster when temperature is high."

Notice the difference? The keywords "transpiration" and "stomata" earn you the full marks.

Biology Writing Strategy

Read the question carefully - What process is it asking about?
Think of the scientific term - What is the technical name?
Use that keyword in your first line - Make it obvious to the examiner
Add supporting details - Explain the process in 2-3 sentences
Draw a diagram if asked - Label everything clearly

Real Student Success: Priya used to write Biology answers in everyday language. Her teacher told her to use scientific keywords. She started underlining the keywords in her answers. Her Biology marks jumped from 23/30 to 28/30 in pre-boards.

⏰ The "Golden Hour" Strategy: Your Final 24 Hours

Tomorrow is your exam. What should you do today? What should you NOT do?

Morning (2-3 hours): Quick revision of important topics

Go through your formula sheets (Physics)
Revise important chemical equations (Chemistry)
Read through your keyword list (Biology)

Afternoon (1-2 hours): Solve previous year questions (just 5-6 questions per subject)

Focus on 3-mark and 5-mark questions
Practice writing complete answers
Time yourself

Evening (1 hour): Diagrams practice

Draw 2-3 important diagrams for each subject
Label them properly
This is easy marks and builds confidence

Night (30 minutes): Light revision only

Quick look at important points
Do NOT start new topics
Do NOT stay up late
Sleep by 10:30 PM latest

✓ DO This Today

Revise what you already know
Practice important diagrams
Solve a few previous year questions
Sleep for 7-8 hours
Stay calm and positive

✗ DON'T Do This Today

Start learning new chapters
Panic if you find gaps
Stay up late cramming
Compare with friends
Overthink or stress

✍️ Presentation Tips That Earn Extra Marks

Your handwriting does not need to be beautiful. But your answer needs to be easy to read. The examiner has hundreds of papers to check. Make their job easy, and they will reward you.

? Presentation Checklist for Every Answer

Use bullet points for listing (much easier to read than paragraphs)

Underline important keywords and scientific terms

Draw diagrams with a pencil and ruler (neat lines matter)

Label every part of every diagram

Leave proper margins and spacing between answers

Write question numbers clearly

Presentation Matters: Two students wrote the same correct answer. Student A wrote it in one long paragraph with no spacing. Student B used bullet points, underlined keywords, and left space between points. Student A got 4/5. Student B got 5/5. The presentation earned that extra mark.

You Are Ready for This

You have studied for months. You know the concepts. You have solved the questions. Now you just need to present your knowledge properly.

Remember these three things:

1. Physics: Write units, label diagrams
2. Chemistry: Balance equations, mention states
3. Biology: Use keywords, underline them

Do not panic. You have got this. Go into that exam hall with confidence. Read the questions carefully. Write neatly. Show your work. And trust your preparation.

All the best for February 25th. Make us proud! ?