Linked difficulties are problems in different sciences that share one underlying skill. Preparing them before a one-hour trial means the lesson starts on your real gap instead of on introductions. It is the last step of 0653 revision and route planning.
How do you find the link?
Look at your mistake log and ask what the failed steps have in common.
- List three wrong answers from different sciences.
- Underline the step that failed in each, not the topic.
- Group by skill: reading a graph, rearranging a formula, using units, explaining a cause in words.
- Choose the group with the most entries, and bring one question for each.
Worked example
Invented log entries.
Chemistry: the volume of gas collected in a reaction was 36 cm³ after 90 s, and the student wrote “rate = 90 ÷ 36”. Physics: a trolley travelled 36 m in 90 s, and she wrote “speed = 90 ÷ 36”. Biology: an enzyme product reached 36 units in 90 s, and the rate was again written upside down.
The link: all three are “amount ÷ time”, inverted. The shared skill is reading a rate as change per unit time.
The correct working: chemistry 36 cm³ ÷ 90 s = 0.4 cm³/s. Physics 36 m ÷ 90 s = 0.4 m/s. Biology 36 units ÷ 90 s = 0.4 units/s. Check: 0.4 × 90 = 36.
Three topics, one skill. The trial can spend an hour on it, with one example from each science.
What is the mistake to watch for?
Bringing a broad request such as “I need help with everything”.
Mistaken brief: “Please teach me all of chemistry, physics and biology.”
No hour can do that, and the teacher cannot tell where your reasoning slips.
The correction is a short list with working: three difficulties, one failed question each, and your own words on what confused you.
Check yourself
1. Three wrong answers: a rate in chemistry, a speed in physics, a growth rate in biology. What is the linked skill?
Show answer
Reading a rate as change divided by time.
2. 45 cm³ of gas in 90 s. What is the rate?
Show answer
45 ÷ 90 = 0.5 cm³/s. Check: 0.5 × 90 = 45.
3. Why bring your own working and not only the question?
Show answer
The working shows which step fails. A correct answer key only shows that the final answer was wrong.
Where this leads next
Finish the module with the original mixed practice. When your list is ready, read how the paid one-hour trial works through online one-to-one Combined Science tuition.