Suggestion for an edtech company.

Hey grapeviners! Recently I am planning to upskill myself but it was not as expected and I am low on confidence in cracking interviews and calls. I have decided to join some upskilling program on DSA and system design, some included FSD and for placement assistance having experience of 3 years. I have noted scaler, crio, bosscoder, airtribe, Heycoach and overwhelmed with many options.

Can anyone suggest,share your experience on any one these?