Hi, Solomon:
Some of my college mates are now teaching Chinese in Singapore. They work for the Ministry of Education of the Singaporean government. If you really need a qualified Chinese tutor, I may try to contact them to see if they are available. I hope you understand I'm not doing advertisements here, I simply think they're very good teachers and coincidentally you're asking for lessons in Singapore. If you don't feel like spending too much money, I guess maybe some of them would like to make language exchanges, English-Chinese. But I'm not sure about this, I'll ask them.
If you think it's a good idea, send me a message. I'll send you back their msn, with their permission.