The major problem is that the number of Indians who come directly through fraud Indian companies are much higher than those international students who graduate from here. This is the key problem for students who apply for H1B within USA.

And, when you join any company you will see 90 percent if Indians who did not study here. Hence, you imagine how many are entering here through Indian IT companies. And majority of Indians who come in IT field don't have Computer Science degree. They obtain some trainings (some real trainings some fake) for few months.