Handwriting - الخط
This is an oft-neglected area of study--both a science and an art. Excelling in it improves the ability reading. Although the emphasis on writing beautifully and decorating with calligraphy has decreased over the years, it is an important part of Qurʾānic Arabic and has been an important part of Islamic history since the time of the Prophet Muḥammad, ṣalla l-lāhu ʿalayhi wa sallam, when his companions, raḍiya l-lāhu ʿanhum, used to carefully transcribe the Qurʾān in his blessed presence.
Many different resources are used for the various grades, but the thing in common is that the target script is naskh and each exercise must have arrows to help students write in the proper direction.
The writing books published by the Kingdom of Saudi Arabia's Ministry of Education are excellent examples of this, although they contain two scripts, both naskh (used in the ʿuthmāniyy Qurʾān) as well as ruqʿāh (wide-spread in the Arab word as the script for hand-written material from class notes to letters):
The website Calligraphy Qalam has a lot of useful information on Arabic, Ottoman, and Persian calligraphy.