A quick look through these posts would quickly show you lots of people have done type ratings in the last three years. It almost a continuous process.
Rather than post a rather obvious question, could you please use the SEARCH function and spend a little time researching for yourself. Not only wil thatl answer your own question but you will also get a great insight into the industry that you chosen.
HWB
PS Closing the thread for now - if you have any further questions after have done the research please drop me a pm and we can take it from there.