it might be tricky, especially now, however, you can try. In the end, the overall picture counts, and there are many contextual factors that influence the decision.
To illustrate, if you had bad grades but at the same time started a company, grew it and hired employees, and sold it to an investor, that shows that you had your priorities right. In that case, you could outweigh bad grades with entrepreneurial experience (as you specifically ask for)
In general, I always recommend early stage coachees to optimize the following four points on the resume:
- academics (university prestige, program prestige, GPA, awards, etc.)
- career (corporate, lower-tier consulting, working student, student projects, etc.)
- experience abroad (exchange or internship abroad)
- extracurriculars (captain of a team, founder of an NGO, etc.)
The more you have from the above list, the better your chances you will be. One word on the contextual factors from above. This can also vary across offices, time of hiring, the personal motivation of HR, etc.
Additionally, in your position, you need to focus on networking across all three MBBs. The more referrals you get, the higher quality and seniority these referrals are, and the more contacts you create, the better your chances will be to pass the HR screening.
All the best!