Answer 1

Online Test Engine http://loorex.com provides possibilities to put users in same environmental conditions as during a real certification exam alongside it can be used as a Certification Engine to secure and verifying real knowledge of tested subject.With it you can download exams from http://onlinetestcentre.com website and get prepared for it.

Answer 2

In my opinion, the best way to learn is to keep practicing.
If you're having trouble with particular topics, google it, read the docs, and make a couple programs using it. If you encounter any problems, ask them here or at other coding communities (such as StackOverflow).
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For general application and problem solving practice, here are some great sites
https://codefights.com
http://www.pythonchallenge.com
https://www.codewars.com
https://projecteuler.net
https://www.hackerrank.com
https://www.hackerearth.com
https://codecombat.com
https://brainwar.it
https://www.codecademy.com/
http://www.programmr.com
https://www.codechef.com
http://www.codeabbay.com
https://www.topcoder.com
https://coderbyte.com
https://leetcode.com
http://exercism.io
http://www.cyber-dojo.org
http://codingbat.com
https://codegolf.stackexchange.com
https://www.codingame.com
http://www.programmr.com
https://programmingpraxis.com
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Good luck.

Answer 3

help me with JUMP_LINK__&&__python__&&__JUMP_LINK what course are you taking. I have no idea about it.

Answer 4

I find this site very useful, I am preparing to appear for 98-381 certification