Most students preparing for Class 10 and Class 12 board exams focus on the obvious problems — not studying enough, leaving topics too late, not doing past papers. Those matter. But the mistakes that separate a 420 from a 460 are usually not about content coverage. They are quieter habits that cost marks almost invisibly.
Here are ten of the most common ones, drawn from patterns seen year after year in how students approach the final weeks before their Tamil Nadu board exams.
1. Studying hard but not practising writing
Knowing the answer and being able to write it under exam conditions are two different skills. Students who read their notes repeatedly without practising written answers frequently underperform in exams — not because they do not know the content, but because they cannot express it clearly under time pressure.
Start writing full answers at least four weeks before the exam. Time yourself. Do not check notes while writing.
2. Ignoring the mark scheme structure
Board exams are not testing your knowledge alone — they are testing your ability to present it in the format the evaluator expects. A 5-mark question has a structure: points, elaboration, example (where applicable). A student who writes everything they know in a paragraph form, without numbering or structuring, will lose marks even when the content is correct.
Study the mark allocation. For every question type, know how many distinct points are expected and write accordingly.
3. Skipping questions they find difficult during revision
It feels logical to spend revision time on what you are good at — it builds confidence. But the marks you gain from improving a strong subject from 80 to 88 are the same marks you could gain by turning a weak subject from 45 to 53. Weak areas are where revision time pays the highest return.
The mark you are missing is almost always in the chapter you have been avoiding.
4. Not reading the question properly
This is the most reported cause of avoidable mark loss among Tamil Nadu board students. "Explain" and "describe" require different responses. "List any four" means four — not six, not two. "With reference to the diagram" means the diagram matters to your answer.
In the exam, read every question twice before writing a word. Underline key instruction words.
5. All-night studying in the final week
Sleep is not rest time stolen from revision. During sleep, the brain consolidates the day's learning into long-term memory. A student who studies until 2 AM and wakes at 5 AM has effectively erased a significant portion of what they studied. On exam day, they are slower, less focused, and more likely to go blank under pressure.
In the final week, fix a sleep time and hold it — even if it feels like wasted time. Eight hours of sleep before the exam is worth more than two additional hours of revision.
6. Not doing past papers under timed conditions
Reading past papers and doing past papers are completely different activities. Doing them under timed, exam-like conditions — no notes, no phone, full duration — reveals time management issues, weak areas, and format unfamiliarity that reading never would. Students who do at least five full timed papers before the exam consistently perform better than those who study more but test themselves less.
7. Starting the answer paper slowly
Many students spend the first 15 minutes re-reading the question paper multiple times, feeling uncertain, and waiting for confidence to arrive. Confidence arrives from writing, not from waiting. Start with the question you find easiest, write it fully, then move forward. Momentum in the first 20 minutes determines the rhythm of the entire paper.
8. Poor time allocation during the exam
A student who spends 25 minutes on a 3-mark question has made a decision that will cost them somewhere else in the paper. Before the exam, calculate how many minutes each mark should take. In a 3-hour paper with 90 marks, each mark is approximately 2 minutes. A 5-mark question deserves 10 minutes — not more, not less. Stick to it even if the answer feels incomplete.
9. Not checking the answer sheet before submitting
Students who finish early often submit immediately. Those who use the remaining time to check — verifying that question numbers are written correctly, that no question was accidentally skipped, that answers are legible — regularly pick up 4 to 8 marks that would otherwise have been lost to small errors.
The last 10 minutes of the exam are among the most valuable. Do not leave early. Check everything.
10. Comparing preparation with classmates in the days before
The day before an exam is the worst possible time to discover that a classmate has covered material you have not, or that they seem far calmer than you feel. These comparisons serve no useful purpose — you cannot change your preparation at that point, and another student's confidence is not evidence of your inadequacy.
In the 48 hours before each paper: revise, sleep, eat, and avoid conversations about how much others have or have not done.
At The NEST School, Sathyamangalam, exam preparation is built into the academic year — not compressed into the final weeks. Our students in Class 10 and Class 12 practise structured answer writing, timed revision, and past-paper analysis as part of regular classroom work. In 2026, our Class 10 results showed 13 distinctions in 31 students with 100% pass rate, and Class 12 showed 100% pass rate with a top score of 571/600.
If you are a parent thinking about the right environment for your child's board exam years, visit us at Bannari Road, Sathyamangalam, or call +91 99620 09600. More at thenestschools.in.
