Biology 2025–Present
Standard IB Subject
Syllabus
Level
Timezone / Session
Predicted Grade
Using the M25 TZ1 grade boundary
Percentile
Beats 33.6%
of M25 test takers
Weighted score
50%
To Grade 5
2 marks
| M25 TZ1 grade boundaries | ||||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 0-12 | 13-25 | 26-38 | 39-51 | 52-63 | 64-76 | 77-100 |
Next grade
Grade 4 → 5Grade outlook & more options
Grade outlook
This grade has varied before
A boundary 12 marks higher would make this Grade 3.
Compare assessments
Assessment
+1 mark
To Grade 5
Paper 1a
+0.63% overall
+3
Paper 1b
+0.68% overall
+3
Paper 2
Best
+0.88% overall
+3
Individual Investigation
+0.83% overall
+3
| SL Biology Grade Distribution | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Exam SessionSession | Total studentsStudents | Average gradeAvg | Grade (%)% | |||||||
| N | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |||
| N25 | 5,1235.1K | 3.8 | 1.21.2 | 1.01.0 | 10.910.9 | 35.135.1 | 25.125.1 | 14.114.1 | 8.58.5 | 4.24.2 |
| N24 | 4,7144.7K | 3.8 | 1.01.0 | 0.40.4 | 12.512.5 | 33.533.5 | 24.724.7 | 14.514.5 | 9.69.6 | 3.73.7 |
| N23 | 4,6634.7K | 3.7 | 1.41.4 | 0.60.6 | 12.712.7 | 36.536.5 | 25.325.3 | 13.113.1 | 7.37.3 | 3.13.1 |
| November SessionsNovember | 14,50014.5K | 3.8 | 1.21.2 | 0.70.7 | 12.012.0 | 35.035.0 | 25.025.0 | 13.913.9 | 8.58.5 | 3.73.7 |
Historical Grade Boundaries
Compare official grade thresholds across examination sessions.
Level
SL Biology
Minimum score needed for each grade across past sessions.
How to read this chart
Each point is the typical published boundary for that exam session. Hover or tap a point to see the timezone range.
Read the plain-language results guide →SL selected
SL boundary history
| SL Biology | |||||||
|---|---|---|---|---|---|---|---|
| Exam sessionSession | Minimum mark for gradeMinimum mark | ||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
| N25 TZ3 | 0 | 14 | 24 | 39 | 52 | 64 | 77 |
| N25 TZ1 | 0 | 14 | 25 | 40 | 52 | 66 | 78 |
| M25 TZ3 | 0 | 11 | 21 | 33 | 46 | 59 | 72 |
| M25 TZ2 | 0 | 13 | 24 | 36 | 48 | 60 | 72 |
| M25 TZ1 | 0 | 13 | 26 | 39 | 52 | 64 | 77 |
Educators Predicted Grades Excel Tool
About sessions and timezones Optional reference
TZ0: Worldwide or combined
•
TZ1 / TZ2 / TZ3: Different paper variants
Choose the matching variant Use the boundary label supplied with your paper or results. Ask your coordinator when it is unclear.
Match the syllabus Compare sessions from the same course version whenever possible.
Treat 2020–2022 carefully Examination arrangements changed during the pandemic, so those sessions may not be directly comparable.
Compare like with like May and November sessions have different student groups. A past pattern does not determine a future boundary.