This is awesome.. I have it.. but considering your rating.. you may want to go for Chess ART by the same developer available on Android and Iphone.. Kindly check the developer Chess King on the app stores..
Chess Tactics for Beginners 2.0 Chess Training Software

Both are good and I got ART for "free" when I bought ctb which is based on the books by a russian teacher.

1. CRT-Art 6.0 is much harder, however tactics for beginners is fantastic software to get started with.
2. not sure if your tablet is ios or android....i have an ipad so i can only advise on that.
Chess tactics for beginners 2.0 is available in the app store through chess king. I can confirm that it uses the exact same exercises as i have both the ipad version and pc version.
https://itunes.apple.com/us/app/chess-tactics-for-beginners/id1142551734?mt=8

Is Chess ART harder or easier than Chess Tactics for Beginners?
CT ART has a significantly harder upper range of problems than CT for Beginners.
CT for Beginners is the software version of Manual of Chess Combinations 1a and 1b by Sergey Ivashchenko. They are excellent chess puzzle books. It has a wide range of difficulty, but the upper end is "only" ~1600-1800.
https://www.amazon.com/Chess-Tactics-Beginners-Training-Software/dp/B004U0YZ0M/ref=sr_1_5?s=software&ie=UTF8&qid=1480697434&sr=1-5&keywords=chess+tactics
Question 1: Any thoughts on this product?
Question 2: Can this software be used on a tablet?
The software is highly recommended here:
http://www.gautamnarula.com/how-to-get-good-at-chess-fast/