I think its very unfortunate to have your kid's education suffer because of your career prospects. Anyways, the best way is you should use these 5 months as an opportunity for your child. Get him a private tutor who can teach him all the basics and when he hits the school, he will come out as a topper of the class as he would have learned everything already which shall be taught in the school. I suggest you should utilize this time of his wisely. You can also enroll him to some creative classes.