For HSK Level 1 preparation, the following study materials are recommended:

Grammar Guides: Guides that focus on the grammar points covered in HSK Level 1 can help learners understand and apply the grammar rules in context.
Textbooks:
“HSK Standard Course 1” (Published by Beijing Language and Culture University Press): This textbook is specifically designed for HSK Level 1 and covers all the necessary vocabulary, grammar, and skills required for the exam. It includes a textbook, workbook, and teacher’s book, along with MP3 audio files.

“New HSK Speed-up Intensive Course” (Also published by Beijing Language and Culture University Press): This series is suitable for short-term intensive training before the exam and provides targeted practice on grammar, vocabulary, and exam strategies.
Online Resources:
ChinesePlus (chineseplus.net) and Chinese Test Service Website (chinesetest.cn): These websites offer sample questions, past exam papers, audio materials, answers, and exam guides. They are comprehensive resources for HSK preparation, covering all levels from HSK 1 to 6.
Mobile Apps: Apps like HanBook, HSK Exam, and ChinesePlus provide convenient platforms for learning and practicing HSK vocabulary, grammar, and listening skills on the go.

Practice Tests and Mock Exams:
“HSK Past Exam Papers” (Published by Higher Education Press): This series includes official past exam papers, answers, listening materials, and MP3 CDs. It is a valuable resource for familiarizing oneself with the exam format and types of questions.
“Mock Test Collections for HSK” (Published by Beijing Language and Culture University Press): These collections contain 10 sets of mock笔试 (written) tests for each level, along with listening texts, answers, and audio resources. They are useful for self-assessment and final exam preparation.

Supplementary Materials:
“HSK Vocabulary Lists”: These lists, often available online or in textbooks, provide a concise overview of the vocabulary required for each HSK level. They are useful for memorization and review.