If you can afford to pay school fees like 50 to 60k ringgint per year for school fees alone, then welcome. That is around 5K Ringgit per month. Such is around sgd 2k per month.
If you can afford that, why not ? If you can't, stick to MOE school in Singapore
Plus enrichment and CCAs, better budget S$3k a month. To be comfortable, household income should be at least S$8k for 1 child attending international school in JB and S$11k for 2 children. I would rather save $2-3k a month on the school fees and build up an investment fund for them when they graduate: S$2k x 12 months x 14 years (pri-school to JC equivalent) = S$336k.