Hello Salma,
Considering you are asking about the preparation of NEET exam, NEET is the largest entrance exam for admission to medical, dental and AYUSH courses and if you are determined you can definitely crack the exam.
Many students crack the NEET exam without coaching. To start your prepartion, you should know about the detailed syllabus and pattern of the exam.
Study from NCERT textbooks. NCERTs are the best books to strengthen your basic concepts. You can also refer to other important books for in depth knowledge.
Make a time table for your preparation and follow the schedule religiously.
With a scheduled study plan, dedication and hard work you can perform well in the exam.
You should also practice previous year question papers and mock tests to know about the types of questions asked in the exam, difficulty level of the exam and it also helps in time management as speed and accuracy both are the key factors.
Go through the link below for the preparation tips

 https://medicine.careers360.com/articles/how-prepare-for-neet-without-coaching

Good Luck!

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