I am a tutor

I had a group of teenagers to whom I gave them taught some classes about in religion, healthy habits and adolescence. also I've also spent time teaching to children math and some basic words in English.

I think the poster aboveis confused when she says that math is written maths in the US and Canada. I have never heard anyone in the US call mathematics "Maths", and I have several Canadian friends that do not call it "maths" either. This would certainly be incorrect.

I am a tutor

I had a group of teenagers that I gave them some classes to, about religion, healthy habits, and adolescence. I have also I've spent time teaching to children math and some basic words in English.

More correct:

I gave some classes on religion, healthy habits and adolescence to a group of teenagers. I have also spent time teaching children math and some basic words in English.

Note that in the UK mathematics is written "math" and in the US and Canada mathemtaics is written "maths" - both are correct, it just depends where you are based and who you are teaching or writting to.

I am a Tutor

I had a group of teenagers I gave them some classes to, about religion, healthy habits, adolescence, etc. also I've also spent time teaching to children maths and some basic words in English.