最新考纲上官网去看吧。3L和MLC有什么区别的话，我也不知道，只是觉得3L明显要容易很多。TIA video是什么东东？

同问呀~~ 到底怎么报名

The most recent syllabus can be found on SOA (MLC) and CAS (3L) websites.

If you pass MLC, both SOA and CAS recongize credit for exam on life contingency.

Only CAS, but not SOA will grant you credit if you pass 3L.

I did not use TIA online lecture.  You can get discount if you are university student.

Registration:

MLC thru SOA website.

3L thru CAS website.

you can not transfer credit between SOA and CAS now.
contents are different, you'd better check both website to get the updated info.