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Here’s a 20-day GST Unit A (Science) crash plan for Bangladesh.

The live GST portal for the 2025–26 cycle shows Unit A (Science) on Friday, 10 April 2026, 11:00 AM–12:00 PM. The official portal also shows the current Unit A eligibility for science-background students as minimum GPA 3.25 in both SSC/equivalent and HSC/equivalent, with total GPA at least 7.00. (gstadmission.ac.bd)

Because the current official prospectus page is hard to open directly, I cross-checked recent admission summaries. They consistently describe Unit A as a 1-hour, 100-mark MCQ exam with negative marking of -0.25 for each wrong answer, built around 25-mark subject blocks. Recent summaries also agree that Physics and Chemistry are central, and that you complete the paper through a combination of the remaining science/language options in line with the current Unit A pattern. (gstadmission.com)

The right way to use these 20 days

Your goal is not to “finish every chapter.”
Your goal is to do 3 things well:

Lock your high-yield chapters.
Practice timed MCQs every day.
Build an error notebook and revise it repeatedly.

Use this daily structure:

Block 1 (2.5–3 hrs): concept review
Block 2 (2–2.5 hrs): MCQs from that topic
Block 3 (2 hrs): mixed practice + error correction
Night (30–45 min): formula/reaction/grammar revision

If you can study full time, do 7–8 focused hours. If not, do 5–6 hard hours, but keep the same structure.

Subject priority

Base your preparation on this order:

1) Physics
Most students lose marks here because of formula confusion and conceptual traps.

Focus on:

units, dimensions, vectors
motion, force, work-power-energy
waves, optics
electricity, current, circuits
modern physics basics

How to study:

memorize formulas chapter-wise
solve short numericals fast
mark every “trap” MCQ you miss

2) Chemistry
This is often the fastest scoring subject if your basics are clean.

Focus on:

atomic structure, periodic trends
chemical bonding
mole concept, gases, thermochemistry
equilibrium
organic basics, reactions, named patterns
inorganic facts and exceptions

How to study:

make a one-page sheet for each chapter
revise reaction conditions every day
practice fact-based MCQs aggressively

3) Math or Biology
Pick your stronger scoring subject and make it your weapon.

If Math is stronger, focus on:

algebra
functions
trigonometry
differentiation/integration basics
coordinate geometry
vectors and probability

If Biology is stronger, focus on:

cell and biomolecules
genetics
human physiology
plant physiology
reproduction
ecology/classification

4) English / Bangla
Do not ignore these. In a tight exam, language can rescue your score.

For English:

parts of speech
subject-verb agreement
tense, narration, voice
vocabulary, synonyms/antonyms
sentence correction

For Bangla:

ব্যাকরণ
সন্ধি, সমাস, কারক, বিভক্তি
বাগধারা
সাহিত্যিক ও রচয়িতা
শুদ্ধ-অশুদ্ধ / বানান

20-day plan

Days 1–4: Build the base

Day 1: Physics set 1 + 50 MCQs
Day 2: Chemistry set 1 + 50 MCQs
Day 3: Physics set 2 + 50 MCQs
Day 4: Chemistry set 2 + 50 MCQs

Rule: don’t move on until you write down every mistake.

Days 5–8: Finish the heavy science core

Day 5: Physics set 3 + timed mini test
Day 6: Chemistry set 3 + timed mini test
Day 7: Physics revision + mixed P/C MCQ set
Day 8: Chemistry revision + mixed P/C MCQ set

By the end of Day 8, Physics and Chemistry should be at least 70% ready.

Days 9–12: Your scoring optional + language support

Day 9: Math/Biology topic 1 + MCQs
Day 10: Math/Biology topic 2 + MCQs
Day 11: English + MCQs
Day 12: Bangla + MCQs

Do not try to make language “perfect.”
Aim to become safe and accurate.

Days 13–15: Mixed syllabus pressure phase

Day 13: Physics + Chemistry mixed test
Day 14: Optional subject + language mixed test
Day 15: Full mixed set under time pressure

From this point onward, every day must include at least one timed section.

Days 16–18: Mock exam phase

Day 16: 1 full mock + full review
Day 17: 1 full mock + weak-topic repair
Day 18: 2 half-mocks or 1 full mock + speed drill

The most important part is not the mock score.
It is your review:

Which questions did you know but mark wrong?
Which chapters are repeatedly hurting you?
Which guesses cost you marks?

Day 19: Final weak-zone repair

Only revise:

formulas
reactions
exceptions
grammar rules
repeated mistakes from your notebook

No new chapters.

Day 20: Final polish

1 light mock or 40–50 MCQ drill
revise short notes only
stop heavy study at night
prepare admit card, pen, route, sleep early

Smart exam strategy

Since recent summaries describe -0.25 negative marking, do not play a blind-guess game. Accuracy matters more than ego. (gstadmission.com)

Use this 3-round method:

Round 1: answer only sure questions
Round 2: solve moderate questions that need 30–60 seconds
Round 3: attempt only those doubtful questions where you can eliminate options

Good rule:

sure = attempt
50/50 = only attempt if your elimination is strong
random = leave

Materials you should use

Use only 3 things:

one reliable chapter-wise MCQ book/question bank
previous GST/cluster-type questions
your own short notes/error notebook

Do not collect 10 guides in 20 days. That destroys revision.

What a perfect day should look like

Example:

Morning: Physics chapter + formula list
Afternoon: 60 MCQs from Physics
Evening: Chemistry revision + 40 MCQs
Night: 20 min English/Bangla + error notebook

That is enough. Consistency beats “motivation.”

Final guide to actually crack it

To crack GST Unit A in 20 days:

make Physics + Chemistry your backbone
choose Math or Biology as your scoring weapon
keep English/Bangla alive every day
solve MCQs daily
sit for mocks in real 1-hour conditions
maintain an error notebook
avoid blind guessing because of negative marking (gstadmission.com)

If you follow this seriously, 20 days is enough to become competitive.

I can also turn this into a day-by-day routine in Bangla or make you a subject-wise chapter priority list for Physics/Chemistry/Math/Biology.