All Indian Schools in Doha are affiliated with the CBSE board of India. This means that the quality of education in classes 11 and 12 is just as good as it is in India.
Most schools have Science Labs as well.

FIITJEE is available at DPS:
http://www.dpsmisdoha.com/DPSDoha/UserSpace/UserName/admin/DynamicFolder...

and also at MES:
http://www.mesqatar.org/news/news214.htm