Cricket is mainly about 2 things: Judgment and Mind-Body co-ordination.
You need to train your mind to make accurate judgments about the ball (e.g. about its pitch, flight, line, length, etc.).
You also need to train your mind and body to be in sync with each other — so that when your mind judges the ball to be of a certain type, your body can quickly adjust and come in the right position or stance.
Both these things require practice — not just physical practice, but mindful practice.
Such practice is best done not in a group–but alone. See this clip which illustrates how Don Bradman used to do his solo practice:
Practicing alone can train both your Judgment and Mind-Body co-ordination, very effectively. Provided you have created the right conditions for your solo training.