As I said earlier,Your Lagna is Tula.
Guru in 10th house is very good ,generally.
But in your case,Guru is owner of 3 rd and 6th houses.
He is very bad for Tula lagna.
So,you have to add those two rules above.
The net result will be mixed results.
That is why ,you have to do penance sincerely,
for one or two years. firstname.lastname@example.org