1600X — Digital SAT, EST & ACT Test Prep

1600X is a standardized test prep platform for the Digital SAT, EST and ACT: realistic timed mock exams, EST past papers, structured video courses and a topic-by-topic question bank with instant score analytics.

Courses

• Basics — Digital SAT
• Vocabulary — Digital SAT

Digital SAT Mock Exams

• Basics Assessment Test — 32 min
• June Exam 2026 Form C: Module 1 — 32 min
• Mock 6 Module 1 — 32 min

EST Exams

• EST I – HS Literacy Test (March 2026) — 90 min
• EST I – HS Literacy Test (May 2026) — 90 min