The best tip I was ever given for writing my CV is:
Always remember that the first person that reads your CV does NOT want to give you the job
And it's true. The purpose of your CV is not to get you the job, it's to get on onto the shortlist for interview. The person that draws up the shortlist has a stack of 200 CVs on their desk and wants to get it down to no more than 10 as fast as possible.
They want to find reason to reject 150 CVs before the kettle boils. They want to reject the next 40 before their coffee cools and they start their normal tasks for the day.
The first round of rejections is the easiest - there will be at least fifty generic CVs that show no effort to meet the requirements in the job advert, there will be at least 25 applying for a different job to the one advertised. The last few rejections get harder and can be for all sorts of spurious reasons.
Make sure your CV matches the job specification your applying for exactly. Make it easy for the person reading it to see how you meet the requirements listed in the advert.
If you're sending in the same "standard" CV to multiple vacancies, you might as well not bother.