how do you know....that you know? ....see Webnote 94 in Study Skills!
Resource 1: 
Resource 2: 
Resource 3:
Resource 4: ​
     29   Essential             Diagrams ​
1. ED 1:  Markets+ Resources
2. ED 2: Externalities
3. ED 3: PPC
4. ED 4: Full Employment
5. ED 5: Direct Taxation (Progressive)
6. ED 6: Laffer Curve​
Section 1
Intro

diagrams in sections 2-4

Relevant diagrams can be found in sections 2-4 
e.g. importance of 'marginal economics' analysis in externalities and market power. For example  MC = MR   guides firm to locate maximum profit output level.
7. ED 7: Tariffs
8. ED 8: 3 Elasticities
9. ED 9: Lorenz +Gini
10. ED 10: Circular Flow + Business Cycle
11. ED 11: Philips Curve (short run)
12. ED 12: J-Curve
Section 2
Micro

13. ED 13: Market Power
14. ED 14: Market Power
15. ED 15: Market Powerf
16. ED 16: Market Power
17. ED 17: Philips Curve  (long run)
18. ED 18: AS/AD Labour
19. ED 19 Price Control
20. AS/AD + Demand Side Economics
21. AS/AD: Supply Side Economics​
​Section 3
Macro
22: 3 Inflations
23. Poverty Cycle
24. Consumer+ Producer Surplus
25. AS/AD + Unemployment
26. Exchange Rates
27. Quota
28. Trade Subsidy
29. Fixed + Floating Exchange Rates
Section 4
Trade+ Development
Picture
ED 5   Direct Taxes