Question: Is there an online platform that provides adaptive, full-length and mini tests to help students prepare for the SAT and ACT exams?

If you're looking for an online service that offers adaptive, full-length and mini tests to help students prepare for the SAT and ACT exams, R.test is a good option. This AI-based diagnostic test service offers a range of features, including full-length and mini tests, stage-adaptive difficulty adjustment and detailed analytics reports with step-by-step explanations. With more than 1500 practice questions in its Q Bank, students can create their own test sets and track their progress with unlimited practice access for 90 days.

Another all-purpose resource is Khan Academy, a free, nonprofit online learning platform. Khan Academy has a wealth of materials, including test prep for the SAT, LSAT and MCAT. The service is personalized, so students can learn at their own pace and fill in gaps in their knowledge, and it's a good option for students who want a more structured learning experience.

For educators and ed-tech companies, PrepAI offers a powerful question generation service that uses sophisticated AI technology to generate high-quality question papers. The service accommodates a range of question types and can generate quizzes instantly so you can easily create and manage tests. PrepAI is a good option for those who want to improve critical thinking with adaptive and personalized question sets.