You can learn tally by actually learning it and that takes time. Since you claim that you don't have too much of it, i suggest you drop the idea.
Regarding the photoshop question, i have no clue so as to what you're talkin about.
There are web sites, but they don't pay for a temporary position. Even if they do, you may have to wait a long time to actually see a pay cheque.
Now, as far is beta testing is concerned, no corporation will pay you to test their software. Simple. Most pre release external beta testing is done on a voluntary basis. The proper testing is done internally, or is sourced to professional co.s who do it for the corporations.
My suggestion - Get a proper summer job. Thats the only thing thats actually gonna get you a decent amount of money. You really can't expect to make any money online unless you have a brilliant idea (Like a digitized map of the indian sewer system

), and you're a born genius. Go join a call centre or something. You'll have fun, you'll learn what it is to work in a professional environ.., and you'll get a decent pay packet at the end of your term there.
After all this, if you still feel ya don't have the time for this kinda stuff, i suggest you trash the entire job idea, sit at home, and log on to TE.
Regards
Inzider