Math is an important life-skill subject. Regardless of which STEMA stream a child takes (Science, Technical, Engineering, Mathematics, Art), Math is very fundamental in his/her life. It's a skill he/she will exercise all the time everywhere whenever he/she is.
It's alright for Tutor to teach 2 subjects on the same day (back-to-back) a 5min break in-between should be allocated.
During school holiday season, extra lessons could be arranged to ramp up for PSLE/CA2/SA2. That could mean, 2 hours is recommended after SA1. Rate: $45 / hour.