The 11 Practicals
Every colour change, timing and measurement is sourced from the syllabus and the textbook, and every run gives you different samples.
- Estimating the size of onion cells under the microscope
- Food tests: what is in samples A, B and C?
- Catalase in living tissue
- pH and the rate of an enzyme reaction
- Temperature and the rate of an enzyme reaction
- Osmosis in potato tissue
- Moving air and the rate of transpiration
- Water uptake: which tissue carries the dye?
- Conditions needed for photosynthesis: the starch test
- Aerobic and anaerobic respiration: carbon(IV) oxide
- Breathing rate after exercise
What Paper 3 Rewards
OBSERVE, THEN RECORD
Note the colour, the time, the mass, the count. A rushed observation is caught and named, so you learn to look properly before you write.
TABLES AND CONCLUSIONS
Complete the table, state the food present, explain the enzyme's behaviour, draw the conclusion — the written half of Paper 3, marked beside the practical half.
AGAIN AND AGAIN
Reset the bench and run the practical a second, fifth or twentieth time. Every run gives you different values to measure, so you cannot memorise a result — you learn the method.
MARKED LIKE PAPER 3
The lab records each step and the server marks the run: the readings you took, the table you filled, the graph you drew and the conclusion you reached. You see where the marks went.
Papers 1 And 2
A BIOLOGY TUTOR
Cell biology, nutrition, transport, gaseous exchange, genetics, ecology and evolution from the KCSE syllabus, by voice or text.
PRACTICE BUDDY
Drills you from the syllabus or from the Biology past paper you upload.
Questions
Do the food tests show the real colour changes?
Yes. Benedict's, iodine, Biuret and the emulsion test change colour as they do at a real bench, with the timing and heating the method needs. Skip the heating and the result is wrong, as it would be in the exam.
Are specimens and drawings included?
The practicals above are the ones live today. Specimen identification and biological drawing are being added; the tutor already covers both in Papers 1 and 2.
Is this free?
You can try a KCSE Practice Buddy as a guest with no sign-up. A free account unlocks the labs and lets you upload your own past papers. Premium adds unlimited tutor time; see the pricing page for the current price in Kenyan shillings.
Which KCSE subjects are covered?
The 3D labs cover the three sciences — Chemistry, Physics and Biology Paper 3. The Practice Buddy and the AI tutors cover the whole KCSE syllabus, Form 1 to Form 4, and will revise any past paper you upload.
Does it work on a phone?
Yes. Everything runs in the browser on an ordinary smartphone over mobile data. The labs are 3D but built to run on low-end phones.