An original experiment and data table: trends, comparisons and inferences — the skills ACT Science really measures.
ACT Science is mostly not about science knowledge — it is about reading tables, graphs and experiment descriptions precisely under time pressure. This set is built around one original experiment (tomato plants under different daily light hours, measured over four weeks) and asks the question types the section loves: read a value, compare two conditions, spot the trend, predict beyond the data, and judge the experiment's design.
Students grew tomato seedlings under three light schedules — 6, 10 and 14 hours of light per day — with the same soil, water and temperature. Average plant height (cm) was recorded weekly:
| Week | 6 h light | 10 h light | 14 h light |
|---|---|---|---|
| 1 | 3 | 4 | 4 |
| 2 | 5 | 8 | 9 |
| 3 | 7 | 13 | 16 |
| 4 | 9 | 19 | 25 |
Very little — a basic grip on experiments (variables, controls, trends) matters far more. The answers are in the data given, not in a textbook.
Read the table headers and units first, then the question, then find the exact row and column. Most errors come from answering a nearby question instead of the one asked.
The ACT's greatest hits: commas, verb tense, pronoun cases, parallelism and sentences that run on too long.
➗Algebra, percents, functions and geometry at real SAT difficulty — every answer worked out step by step.
📖A short original passage plus the grammar and sentence skills the Reading & Writing section actually grades.
