What are the requirements and implications of using a Visa Exemption while on a NON B Visa and Work Permit in Thailand?

Hi Everyone,

I've a question regarding Visa Exemption:

I'm actually on NON B Single Entry, that it will expire on 10th April.

I've Work Permit valid until the end of the year.

I'm planning to stay 1 more month in Thailand, that mean until the 10th May.

After that holidays and back in Thailand in November with a new NON B Visa.

My questions are regarding Visa Exemption, and are:

- to get it, do I need just to exit and Reentry the country before of 10th April?

- with Visa Exemption and Work Permit, can I legally work ?

- if I use Visa Exemption, can I have a new NON B after that?

Thanks to all.