Test Prep
📝
SAT Prep
Digital SAT · 1600 max score
✏️
ACT Prep
36 max score · adaptive testing
🧮
AMC
AMC 8/10/12 · AIME pathway
🏆
UK Admission Tests
UCAT · TMUA · ESAT · LNAT
🏆
Math Olympiads
SASMO · SEAMO · CEMC
📊
GMAT
Graduate admissions
🎯
GRE
Graduate admissions
📝
PSAT Prep
Digital PSAT · 1520 max score
Academics
🎓
AP Courses
30+ subjects · score 5
📘
IBDP
Grades 11–12 · IB Diploma Programme
📗
IB MYP
Grades 6–10 · Middle Years Programme
📕
A-Levels
Years 12–13 · Cambridge & Edexcel
📙
IGCSE
Years 9–11 · Cambridge & Edexcel
About
👥
About Us
Our story and team
🏆
Results
Our students' scores and admissions
⭐
Testimonials
What students and parents say about us
📰
Blog
Tips and resources
Contact Us
GCSE
Ecology
Trophic Levels in an Ecosystem
Trophic Levels in an Ecosystem
Revision notes written from the specification by AP Guru tutors.
Back to all topics
