Couple of things -
If some of you arent interested in helping GCL, or are getting frustrated at doing so - simply walk away. Much better than creating an acrimonious environment where you're browbeating him because of his impatience.
GCL - you ARE going too fast, and (in my opinion) are trying to learn verb conjugations OUT of a logical order, and are only confusing yourself because of it, for example trying to learn "-ta" "-te" conjugations together, when really learning Te-forms of verbs first makes learning the Ta-form and subsequent conjugates/sentence expressions based on Ta-form easier.
Right now you're trying to learn "Dirty Japanese". Learning Japanese in a PROPER way, only helps to reinforce what you learn next. If your goal is just to be able to quickly play Japanese games - its NOT going to happen in no 6 months mate. I remember going to Japan and listeining to this 5 year old, and I could almost understand everything he said, but it pretty much beat home the fact that in order to be proficient in this language - youre going to have to resolve yourself to studying for a long time. And not just studying, but studying intelligently and thoroughly.
NO instructor with half a brain would EVER think to learn all verb conjugates at once, so why are you. My recommended order (after you get yanno basic writing and reading down) for your level:
Present-Tense, Affirmative Polite Form (-masu).
Present-Tense, Negative Polite Form (-masen)
Past-Tense, Affirmative Polite Form (-mashita).
Past-Tense, Negative Polite Form (-masen deshita)
Te-Form of Verbs
Present-Tense, Affirmative Informal Form (Dictionary Form of verb)
Present-Tense, Negative Informal Form (-nai)
Past-Tense, Affirmative Informal Form (-ta, same as -te, just drop E add A)
Past-Tense, Negative Informal FOrm (-nakatta)
You can worry about potentials, transitives, honorifics (Oy for when this young man gets there and comes here) much, much MUCH later.
So you know - without thinking, the Te-forms of all "U verbs"? What about ADJECTIVES - all this talking about verbs, are you comfortable conjugating ADJECTIVES?