The CompTIA Network+ is a basic network cert. That goes over some general network stuff. Your companies may need you need to get certification for a promotion.
Professor Messor is a great resources. He goes thorough the objective in order. This could be a good or bad thing depending on your learning style. A another amazing resources is Jason Dion. His video can easily be made into flashcards. This is what I use for flashcards anki . His has practice exams. They are good but not like the exam. The exam did not have questions like "Bob is having trouble with getting a IP. What is most likely the issue?" They are still good to do to see what areas you need to work on. You can find deals with his Udemy on the weekend.
If you are having troubles with subnetting like I did then you can use this resorces. The chart he uses is really easy to get and remember. For the exam remember 1, 2, 4, 8, 16, 32, 64, 128, 256. This is for the amount of host that can be in a subnet. When it comes to what to practice just do /32 - /16. The smaller subnets are good to know but not I did not see it on the exam.
This exam has a lot of material. If you do not get network concepts ever well like me. I would say 3-4 months of studying. If you can easy understand network concepts then maybe 2-3 months.
Remember this is what type of question I got on the exam. YOU MAY NOT SEE THIS ON THE EXAM.
This concepts was really what I wished I study more but I did not find the time
You will pass. If you think you will not pass then you will not pass. You got this. GOOD LUCK