You only have 1 attempt to clear the Salesforce Certification exam. Her are the detailed of the exam:
There are 60 Multiple-choice questions, approximately five questions are unscored and placed randomly in the question series.
The duration of the exams is 105 minutes.
The passing score for the exam is 68%. To pass the bar, you must have at least 41 to 43 questions right and earn the Salesforce Certification.
The exam costs 200 USD + taxes (nearly ₹17,000/-).
There is no negative marking in the Salesforce Platform Developer I Examination.