Good 2020 prelim to do and difficulty rating

Level 1 (Similar to 2019 and 2020 alevel standard)

1. YIJC (Recommended)
2. JPJC stats (Recommended)
3. MI
4. TMJC
5. CJC

Level 2 (Harder than 2019 and 2020 alevel, similar to 2018 alevel standard)

1. EJC (Recommended)
2. DHS
3. RI
4. RVHS

Level 2+ (Questions similar to alevel style but harder)

1. NYJC (Recommended)
2. NJC
3. SAJC

Level 2++

1. ACJC (Recommended, many good contextual questions)
2. HCI stats (Recommended)
3. TJC P1 (Recommended)
4. VJC Pure maths (Recommended)
5. ASR stats (Recommended)