| ★ |  Professor Messer's A+ 220-1201 Study Group - January 2026 | Professor Messer @professormesser | 20.5K | Estados Unidos | |
| 7 |  Professor Messer's Security+ SY0-701 Study Group - January 2026 | Professor Messer @professormesser | 30.6K | Estados Unidos | 82 |
| 18 |  Professor Messer's Security+ SY0-701 Study Group - February 2026 | Professor Messer @professormesser | 22.1K | Estados Unidos | 74 |
| 5 |  Professor Messer's A+ 220-1201 Study Group - February 2026 | Professor Messer @professormesser | 18.5K | Estados Unidos | 84 |
| 3 |  Professor Messer's Network+ N10-009 Study Group - January 2026 | Professor Messer @professormesser | 17.9K | Estados Unidos | 88 |
| 11 |  Professor Messer's SY0-701 Security+ Study Group - December 2025 | Professor Messer @professormesser | 17.7K | Estados Unidos | 78 |
| 17 |  Professor Messer's A+ 220-1201 Study Group - March 2026 | Professor Messer @professormesser | 15.2K | Estados Unidos | 74 |
| 4 |  Professor Messer's A+ 220-1202 Study Group - February 2026 | Professor Messer @professormesser | 12.0K | Estados Unidos | 85 |
| 12 |  Professor Messer's Network+ N10-009 Study Group - February 2026 | Professor Messer @professormesser | 11.7K | Estados Unidos | 77 |
| 2 |  Professor Messer's A+ 220-1202 Study Group - January 2026 | Professor Messer @professormesser | 10.0K | Estados Unidos | 90 |
| 20 |  Professor Messer's A+ 220-1202 Study Group - March 2026 | Professor Messer @professormesser | 8.6K | Estados Unidos | 74 |
| 14 |  Professor Messer's N10-009 CompTIA Network+ Study Group - December 2025 | Professor Messer @professormesser | 5.7K | Estados Unidos | 75 |
| 9 |  Professor Messer's 220-1202 A+ Study Group - August 2025 | Professor Messer @professormesser | 5.3K | Estados Unidos | 81 |
| 1 |  Professor Messer's 220-1201 A+ Study Group - December 2025 | Professor Messer @professormesser | 5.2K | Estados Unidos | 92 |
| 10 |  Professor Messer's 220-1201 A+ Study Group - November 2025 | Professor Messer @professormesser | 3.9K | Estados Unidos | 80 |
| 6 |  Professor Messer's 220-1202 A+ Study Group - December 2025 | Professor Messer @professormesser | 3.7K | Estados Unidos | 83 |
| 15 |  Professor Messer's 220-1201 A+ Study Group - August 2025 | Professor Messer @professormesser | 3.2K | Estados Unidos | 75 |
| 8 |  Professor Messer's 220-1201 A+ Study Group - July 2025 | Professor Messer @professormesser | 3.1K | Estados Unidos | 82 |
| 16 |  Professor Messer's N10-009 CompTIA Network+ Study Group - November 2025 | Professor Messer @professormesser | 2.9K | Estados Unidos | 74 |
| 13 |  Professor Messer's 220-1202 A+ Study Group - November 2025 | Professor Messer @professormesser | 1.9K | Estados Unidos | 76 |
| 19 |  Professor Messer's 220-1202 A+ Study Group - July 2025 | Professor Messer @professormesser | 1.9K | Estados Unidos | 74 |