It sounds like you're asking whether the practice portal (likely referring to the abacus / mental math program) is a good piece of software or training tool.
Here’s a quick, honest assessment:
An online portal for students enrolled in Brain O Brain (abacus, brain gym, speed writing, etc.) to practice mental math, flash animations, and timed exercises. brainobrain practice portal
Want me to compare it to a specific alternative? It sounds like you're asking whether the practice