There are hundreds of private driving instructors. Some instructors are definitely better than the others. You will want to find the better ones who can coach you better.
Here’s a recommendation – visit the Twitter page for SG Learn To Drive. SG Learn To Drive is a reputable match up agency in Singapore which is focused on matching up private driving instructors to learner drivers in Singapore.
Apart from SG Learn To Drive, there are other match up agencies out there. A simple Google Search will yield you the results.