A-Level Mathematics (Part 1) is a free Android application developed by existon.gr that provides an extensive study guide for students studying A-Level maths. This app covers a wide range of topics, including numbers, surds, polynomials, modulus, inequalities, trigonometry, trigonometric identities, triangles, small angles, the straight line, functions, limits, differential calculus, higher-order derivatives, integration, areas under curves, logarithms, rules of differentiation, and implicit differentiation.

The app is designed for all-size devices and allows users to select a topic from the list or flip through the pages in portrait or landscape mode. With its comprehensive content and user-friendly interface, A-Level Mathematics (Part 1) is an excellent resource for students looking to improve their understanding of A-Level maths. However, it must be noted that the app only covers part 1 of the A-Level Maths syllabus and may not be sufficient for students looking to cover the entire syllabus.