Hello aspirant,
Hope you are doing great. So with regard to your question Indian coast guard GD exam is a written type of exam. It is divided into two sections. Section 1 consists of questions related to Maths, Science, english, Reasoning and Genral Knowledge, whereas section 2 consists of Mathematics and Physics questions.
Section 1 has totally 60 Mark's and you are given 45 minutes, there is no negative marking regarding.
Section 2 consists of 50 questions and 50 Mark's and you will be given 30 minutes of time.
Hope it helps you,
Good luck, Thank you.