I have a L1A. Can my employer convert my L1A into L1B or file GC under EB2? (as a retention / delaying tactic)

If your job responsibilities have changed, they can seek a change of status.

I want to come to the us and obtain a green card but I hear it take very long to get one

That depends. If you arrive here under an F1 and speak a MAVNI-related language, then you may join the US army and bypass the whole green card...

Is it fine to translate my birth certificate my self or by my friends for I-485?

Don't translate it yourself. You can get someone else who is competent to translate from your native language to English in a true and accurate...

Perhaps but what's key in an EB2 case is the requirements for the job itself.

What do I have to do to study in the US?

Here is the information that you need: http://travel.state.gov/content/visas/en/study-exchange/student.html

AOS

This would involve a more thorough consultation instead of positing a "yes" or "no" answer here. A consultation with which the immigration lawyer...

Need Immigration lawyer on payment plan

Use the AVVO search feature, make some phone calls. Many immigration lawyers offer payment plans.

In USA , on B1/B2 visa I filed asylum on canadian land border.Can I visit USA on same visa as claim is rejected?

You might face problems if your actions are deemed to have carried immigrant intent.

How long could be to remove condition decision after I sent more evidence to USCIS

How long can you expect an answer is something that's difficult to answer. You should hear something before your extension letter expires in March...

Inmigración y trabajo

Apply to jobs and send your resume around. You might thereafter be able to come under an H1B.