Is it correct?
Could you check my small entry, please)

Two heads are better than one. Two teachers are better than one.
Double power. Double knowledge.
We remind you that every Monday at 19 o'clock Ann and Tom are waiting for you for the English class for beginners.
Next meeting will be on 29th of October. See you!

Question

Is it correct?
Could you check my small entry, please)

Two heads are better than one. Two teachers are better than one. 
Double power. Double knowledge. 
We remind you that every Monday at 19 o'clock Ann and Tom are waiting for you for the English class for beginners.
Next meeting will be on 29th of October. See you!

Answer

Yes, I would write "every Monday at 7pm". And "October 29th".

Answer

The wording 19 O’clock is a little off - technically and in everyday usage - it would either be 7 O’clock or, if you want to write it out in full, 19 hundred hours. 7 O’clock is better for this sentence, if you want to be sure there’s no confusion you can just add pm. O’clock is a shortened form of the original ‘of the clock’, and as the clock face has only numbers 1-12 that’s why it sounds a little off.

Answer

Oh, thank you, Tom. I will certanly use "at"!

Answer

Also maybe 3 ‘for’s in the same sentence is too many? You could substitute the 2nd one with ‘at’.

Answer

Hi!
Rather good but why don't you use 'the more XXX, the more XXX" in the case.