is there any good course over there in English?
Very few, and they are more in the field of computer engineering. Courses in English are generally inferior to courses in Polish, and are not regarded highly by employers. A degree from a good IIT back home is worth more than a degree from an English-language program in Poland.
is there good job opportunity?
You can get a job with a good IT degree, but the wages will be far below those in the richer countries of the EU or the English speaking countries, and the work less interesting, with fewer opportunities for advancement and quality networking. Savings potential is especially frustratingly low. Most Indians who get a job in Poland leave for better jobs at better wages in richer countries within a year or two. It's not a good place to establish a career, and won't be for quite some time.
Can i want to transfer my studies to Germany after 1st year of University?
Theoretically possible, but, in reality, impossible.