BD Police SI Written common mistakes
BD Police SI Written · Understand the traps and how to avoid them.
Spending disproportionate time on Bangla grammar and literature questions while leaving 40-50 mark sections like General Mathematics and Constitution underprepared, so the aggregate falls below the cut-off even when the Bangla portion is strong.
Candidates come from a Bangla-medium humanities background where language feels familiar and rewarding to revise, so they gravitate to it and avoid mathematics and legal sections that feel uncomfortable; the written test is scored on aggregate, so a single weak section sinks the total.
What to do instead
Build a weekly schedule that allocates fixed blocks to every domain, with at least 30 percent of study time on Mathematics and Constitution/Law; take a full-length mock every two weeks and track section-wise scores so no domain stays below a self-set floor of 40 percent accuracy.
Answering Bangla grammar items by ear instead of applying the rule, for example choosing a wrong sandhi split, mislabelling a compound word, or confusing karak (case) markers in a sentence.
Everyday spoken Bangla hides the formal grammar being tested, so candidates rely on what sounds right; sandhi, samas, and karak follow mechanical rules that intuition cannot supply.
What to do instead
Make a one-page rule sheet for sandhi types, samas types, karak and vibhakti, and pratya; practise 20 items daily by writing the rule name beside each answer before checking, so each choice is rule-driven rather than habitual.
Losing marks in English by writing answers with subject-verb agreement errors, wrong tense sequencing, and articles inserted or dropped, even when the content is correct.
Candidates translate from Bangla sentence structure mentally, and Bangla has no articles and a different tense logic, so interference errors persist unnoticed; they also rarely re-read their own writing for grammar.
What to do instead
Keep a personal error log of the five grammar categories you miss most and do 15 targeted transformation sentences daily; in writing tasks, reserve the final three minutes to check only verbs, articles, and prepositions against that log.
Skipping or rushing arithmetic word problems on percentage, ratio, average, profit-loss, and time-work because they look long, then guessing the last ten mathematics items when time runs out.
Under exam pressure the reading load of word problems feels slower than the marks it yields, so candidates defer them and later have no time; they also lack practised shortcuts for standard problem types.
What to do instead
Learn and drill one shortcut per topic (unitary method for time-work, successive percentage formula, allegation for mixtures) and practise a fixed 25-question arithmetic set in 20 minutes twice a week; in the exam, attempt mathematics first while attention is fresh.
Relying on outdated general knowledge memorised from old guidebooks, giving wrong answers on current affairs, recent appointments, and changed administrative facts.
Static guides are cheap and familiar, but current affairs change every month and old notes silently become wrong; candidates also avoid newspapers because reading them feels unproductive.
What to do instead
Keep a dated current-affairs log updated from a newspaper and a monthly digest, covering national appointments, international organisations, sports, and budget figures; revise only entries from the last twelve months and strike out anything older.
Confusing dates and sequences in Liberation War and Bangladesh history questions, such as mixing up 7 March with 26 March, or misplacing Operation Searchlight relative to the declaration of independence.
The events cluster within a few weeks of 1971, and candidates memorise isolated dates without a timeline, so similar dates collapse into each other under stress.
What to do instead
Draw a single horizontal timeline from 1947 to 1971 with every examinable event, date, and place, and redraw it from memory weekly; attach each date to one distinctive fact (who, where, what document) so it cannot float free.
Treating the Constitution and legal procedure as general reading, so answers on fundamental rights articles, writ jurisdiction, or the stages of a criminal case are vague rather than article-specific.
These topics are read like civics rather than memorised as numbered provisions, and candidates never practise recalling article numbers or procedural steps in order.
What to do instead
Build a numbered fact table of key articles (fundamental rights, writs, emergency, amendment) and a step flowchart for FIR, investigation, charge sheet, and trial; self-test by covering the number column and reciting it, twice a week.
Mixing up police ranks, their powers, and the correct procedural step in investigation scenarios, for example who can record an FIR, when a magistrate is required, or the difference between a complaint and a police report.
Police administration is studied from scattered circulars and hearsay rather than one authoritative procedure text, so candidates learn the vocabulary without the sequence or the authority attached to each step.
What to do instead
Write a one-page procedure map for each scenario type (cognizable offence, non-cognizable offence, arrest, search, seizure) listing the officer empowered and the document produced at each stage; practise scenario questions by naming the step and the authority before choosing an option.
Answering computer and IT questions from casual phone use, so terms like operating system, RAM versus ROM, browser versus search engine, and basic spreadsheet functions are confused or guessed.
Everyday device use never requires naming the underlying component or function, so familiarity with phones creates false confidence; candidates also skip IT assuming it is easy marks.
What to do instead
Study a short structured list of 100 core IT facts (hardware components, software types, shortcuts, number systems, common file extensions, basic security terms) and test yourself with flashcards until recall is instant; do not leave IT to the last week.
Writing the descriptive section as an unstructured essay with no clear introduction, points, or conclusion, and exceeding or falling short of the word limit, so a well-informed candidate still scores low.
Candidates prepare content but never practise timed writing, so they draft as they think, repeat points, and run out of time or space; they also misjudge the word limit because they never count their own writing.
What to do instead
Practise a fixed four-part template (context, two or three argued points, counterpoint, conclusion) on ten likely topics under timed conditions, and count words once per practice to calibrate length; in the exam, spend two minutes outlining before writing.